Add and subtract integers using mental and written strategies
1. | 10 000 less, 1000 more than 9 630 258 | |
2. | Add hundreds: 346 + 400, 1426 + 500, 200 + 7019 | |
3. | Adding hundreds: Multiple operations with hundreds numbers | |
4. | Adding hundreds: Multiple operations with hundreds numbers | |
5. | Adding hundreds: Multiple operations with hundreds numbers | |
6. | Adding hundreds: Multiple operations with hundreds numbers | |
7. | Number detectives: Add/subtract hundreds numbers | |
8. | Number detectives: Add/subtract hundreds numbers | |
9. | Number detectives: Add/subtract hundreds numbers | |
10. | Number detectives: Add/subtract hundreds numbers | |
11. | Number detectives: Add/subtract hundreds numbers | |
12. | Give or take a thousand: 283 557+4000 | |
13. | Give or take a thousand: 7000 more than 456 821 | |
14. | Give or take a thousand: Add 8000 and 197 523 | |
15. | Give or take a thousand: Sum of 7000 and 197 237 | |
16. | Give or take a thousand: Sum of 128764 and 6000 | |
17. | Give or take a thousand: 164849 more than 7000 | |
18. | Give or take a thousand: 345 219 greater than 7000 | |
19. | Give or take a thousand: Sum of 349 285 and 4000 | |
20. | Give or take a thousand: Add 319 564 to 3000 | |
21. | Give or take a thousand: 7000 more than 63 489 | |
22. | Give or take a thousand: 8000 more than 49 735 | |
23. | Changing numbers: 36 159 add 100 add 1 add 10 | |
24. | Changing numbers: 23 855 add 100 add 1 add 10 | |
25. | Changing numbers: 36 052 add 1000 add 1 add 10 | |
26. | Changing numbers: 23 615 add 1000 add 100 add 10 | |
27. | Changing numbers: 36 925 add 10 add 1000 add 1 | |
28. | Use the Pattern: 43 + 39, 43 + 40, 430 + 400 | |
29. | Use the Pattern: 56 + 70, + 69, 560 + 700 | |
30. | Use the Pattern: 34 + 80, + 79, 340 + 800 | |
31. | Use the Pattern: 27 + 90, + 89, 270 + 900 | |
32. | Use the Pattern: 62 + 79, 62 + 80, 620 + 800 | |
33. | Add It Up: Addition of 4-digit numbers with regrouping | |
34. | Add It Up: Addition of 4-digit numbers with regrouping | |
35. | Add It Up: Addition of 4-digit numbers with regrouping | |
36. | Add It Up: Addition of 4-digit numbers with regrouping | |
37. | Add It Up: Addition of 4-digit numbers with regrouping | |
38. | Add It Up: Addition of 4-digit numbers with regrouping | |
39. | Add It Up: Addition of 4-digit numbers with regrouping | |
40. | Add It Up: Addition of 4-digit numbers with regrouping | |
41. | Add It Up: Addition of 4-digit numbers with regrouping | |
42. | Add It Up: Addition of 4-digit numbers with regrouping | |
43. | Add board: Write missing numbers in vertical addition of 2- and 3-digit numbers | |
44. | Add board: Write missing numbers in vertical addition of 2- and 3-digit numbers | |
45. | Add board: Write missing numbers in vertical addition of 2- and 3-digit numbers | |
46. | Add board: Write missing numbers in vertical addition of 2- and 3-digit numbers | |
47. | Add board: Write missing numbers in vertical addition of 2- and 3-digit numbers | |
48. | Add board: Write missing numbers in vertical addition of 2- and 3-digit numbers | |
49. | Use the pattern 6+7 60+70 160+170 | |
50. | Use the pattern 12+8 120+80 1200+800 | |
51. | Use the pattern 21+9 210+90 2100+900 | |
52. | Use the pattern 3+8 30+80 300+800 | |
53. | Use the pattern 16+4 160+40 1600+400 | |
54. | Number detectives Three's a breeze: 31+29+*=87 | |
55. | Number detectives Three's a breeze: 42+12+*=74 | |
56. | Number detectives Three's a breeze: 18+22+*=81 | |
57. | Number detectives Three's a breeze: 56+21+*=88 | |
58. | Number detectives Three's a breeze: 27+23+*=58 | |
59. | Same or different : Click all the boxes with the same answer. | |
60. | Same or different : Click all the boxes with the same answer. | |
61. | T/f Double sided eqns | |
62. | T/f Double sided eqns | |
63. | T/f Double sided eqns | |
64. | T/f Double sided eqns | |
65. | T/f Double sided eqns | |
66. | Add it up 4126+5999 | |
67. | Add it up 5672+6928 | |
68. | Add it up 2369+9872 | |
69. | Add it up 8273+7989 | |
70. | Add it up 7827+6376 | |
71. | Adding hundreds: 695+*=959, 3492+500=*, 600m/t503=* | |
72. | Adding hundreds: 364+*=1264, 426+600=*, 200m/t 236 =* | |
73. | Adding hundreds 562+*=862, 658+200=*, 500m/t 352=* | |
74. | Adding hundreds: 263+*=663, 222+500=*, 600m/t406=* | |
75. | Adding hundreds 462+*=862, 426+300=* 800m/t169=* | |
76. | Give or take a thousand Add 4000 to 2668 | |
77. | Give or take a thousand Add 8000 to 7558 | |
78. | Give or take a thousand what is 5000 m/t 23669? | |
79. | Give or take a thousand what is 6000 m/t 8331? | |
80. | Give or take a thousand what is 19369 + 3000? | |
81. | Add these three numbers 24+45+16=? | |
82. | Add these three numbers 20+35+16=? | |
83. | Add these three numbers 45+15+14=? | |
84. | Add these three numbers 26+12+22=? | |
85. | Add these three numbers 37+13+18=? | |
86. | Number detectives: Four's no chore - Add 4 clustered numbers | |
87. | Number detectives: Four's no chore - Add 4 clustered numbers | |
88. | Number detectives: Four's no chore - Add 4 clustered numbers | |
89. | Number detectives: Four's no chore - Add 4 clustered numbers | |
90. | Number detectives: Four's no chore - Add 4 clustered numbers | |
91. | Same or different: Click all the boxes with the same answer | |
92. | Same or different: Click all the boxes with the same answer | |
93. | Same or different: Click all the boxes with the same answer | |
94. | Same or different: Click all the boxes with the same answer | |
95. | Same or different: Click all the boxes with the same answer | |
96. | Make 150 70+44+* | |
97. | Make 120 52+37+* | |
98. | Make 140 96+14+* | |
99. | Make 130 75+41+* | |
100. | Make 160 57+33+* | |
101. | T/F double sided: 56+14=35+35, etc | |
102. | T/F double sided: 23+12=65+30, etc | |
103. | T/F double sided: 21+80=92-42, etc | |
104. | T/F double sided: 42+46=19+69 | |
105. | T/F double sided: 32+18=25+25 | |
106. | Give or Take 10 000 40000+227558 | |
107. | Give or Take 10 000 50 000+23 565 | |
108. | Give or Take 10 000 40 000+56 780 | |
109. | Give or Take 10 000 20 000 + 239 330 | |
110. | Give or Take 10 000 50 000+50 332 | |
111. | Number detectives: Add 4 clustered tens numbers | |
112. | Number detectives: Add 4 clustered tens numbers | |
113. | Number detectives: Add 4 clustered tens numbers | |
114. | Number detectives: Add 4 clustered tens numbers | |
115. | Number detectives: Add 4 clustered tens numbers | |
116. | Negative Thinking 2 + * = -4 | |
117. | Adding the big ones: Write the missing numbers in vertical addition of large whole numbers | |
118. | Adding the big ones: Write the missing numbers in vertical addition of large whole numbers | |
119. | Adding the big ones: Write the missing numbers in vertical addition of large whole numbers | |
120. | Adding the big ones: Write the missing numbers in vertical addition of large whole numbers | |
121. | Adding the big ones: Write the missing numbers in vertical addition of large whole numbers | |
122. | Changing numbers: Addition/subtraction using negative integers | |
123. | Changing numbers: Addition/subtraction using negative integers | |
124. | Changing numbers: Addition/subtraction using negative integers | |
125. | Changing numbers: Addition/subtraction using negative integers | |
126. | Changing numbers: Addition/subtraction using negative integers | |
127. | Make 20 13+-6+* | |
128. | Make 15 3+19+* | |
129. | Make 10 8+7+* | |
130. | Make 20 8+-2+* | |
131. | Make 15 21+-6+* | |
132. | T/F double sided eqn incl -ive # | |
133. | T/F double sided eqn incl -ive # | |
134. | T/F double sided eqn incl -ive # | |
135. | T/F double sided eqn incl -ive # | |
136. | T/F double sided eqn incl -ive # | |
137. | Add these three numbers: 13+-7+3 | |
138. | Add these three numbers: 9+2+-3 | |
139. | Add these three numbers: 9+8+-5 | |
140. | Add these three numbers: 16+-9+2 | |
141. | Add these three numbers: 20+-9+11 | |
142. | Number detectives: Add 4 clustered hundreds numbers | |
143. | Number detectives: Add 4 clustered hundreds numbers | |
144. | Number detectives: Add 4 clustered hundreds numbers | |
145. | Number detectives: Add 4 clustered hundreds numbers | |
146. | Number detectives: Add 4 clustered hundreds numbers | |
147. | Adding the big ones: Write missing numbers in vertical addition | |
148. | Adding the big ones: Write missing numbers in vertical addition | |
149. | Adding the big ones: Write missing numbers in vertical addition | |
150. | Adding the big ones: Write missing numbers in vertical addition | |
151. | Adding the big ones: Write missing numbers in vertical addition | |
152. | And a Partridge in a pear tree 12+11+10+9, etc | |
153. | Make 13 18+34+* | |
154. | Make -5 27+9+* | |
155. | Make 29 37+20+* | |
156. | Make -8 42+16+* | |
157. | Make 32 29+12+* | |
158. | T/F Double-sided equations | |
159. | T/F Double-sided equations | |
160. | T/F Double-sided equations | |
161. | T/F Double-sided equations | |
162. | T/F Double-sided equations | |
163. | Add these three numbers 84+-11+-16 | |
164. | Add these three numbers -19+55+-26 | |
165. | Add these three numbers -17+-28+34 | |
166. | Add these three numbers -41+-35+47 | |
167. | Add these three numbers 46+13+14 | |
168. | Detective Duck: Add 4 clustered numbers | |
169. | Detective Duck: Add 4 clustered numbers | |
170. | Detective Duck: Add 4 clustered numbers | |
171. | Detective Duck: Add 4 clustered numbers | |
172. | Detective Duck: Add 4 clustered numbers | |
173. | Adding the big ones: Write missing numbers in vertical additions | |
174. | Adding the big ones: Write missing numbers in vertical additions | |
175. | Adding the big ones: Write missing numbers in vertical additions | |
176. | Adding the big ones: Write missing numbers in vertical additions | |
177. | Adding the big ones: Write missing numbers in vertical additions | |
178. | Make 29: 282 + -184 + * | |
179. | Make 180: 369 + -75 + * | |
180. | Make 126: 34+81 + * | |
181. | Make 79: 104 + -53 + * | |
182. | Make 115: -26 + 180 + * | |
183. | Add 3 numbers: 106 + 24 + -6 | |
184. | Add 3 numbers: -72 + 203 + -16 | |
185. | Add 3 numbers: -58 + -245 + 10 | |
186. | Add 3 numbers: -158 + 101 + 69 | |
187. | Add 3 numbers: -36 + -72 + 17 | |
188. | Four's no chore: Add 4 clustered numbers | |
189. | Four's no chore: Add 4 clustered numbers | |
190. | Adding the big ones: Write missing numbers in vertical addition | |
191. | Adding the big ones: Write missing numbers in vertical addition | |
192. | Adding the big ones: Write missing numbers in vertical addition | |
193. | Adding the big ones: Write missing numbers in vertical addition | |
194. | Adding the big ones: Write missing numbers in vertical addition | |
195. | Take Tens 541-60=481,924-90=834 | |
196. | Take Tens 874-80=481,219-20=199 | |
197. | Take Tens 603-10=593,128-50=78 | |
198. | Take Tens 459-70=389,816-40=776 | |
199. | Take Tens 352-70=282,715-30=685 | |
200. | Give or Take Thousands: 260 000 - 5000 | |
201. | Give or Take 1000: 1280000 - 4000 = 1276000 | |
202. | Give or Take Thousands: 22 000 - 3000 | |
203. | Give or Take Thousands: 24 000 - 6000 | |
204. | Give or Take Thousands: 15 500 - 2000 | |
205. | Give or Take Thousands: 12 000 - 1200 | |
206. | 1000s crossing: 5030-4990, 3010-2950, 7970-8040 | |
207. | 1000s crossing: 8020-7940, 4030-3950, 9060-8980 | |
208. | 1000s Crossing: 6015-5999, 8014-7995, 3024-2990 | |
209. | True or False?: 107 - 68 = 41 | |
210. | Same or different: Click all boxes with the answer 126 | |
211. | Same or different: Click all boxes with the answer 175 | |
212. | Same or different: Click all boxes with the answer 426 | |
213. | Same or different: Click all boxes with the answer 146 | |
214. | Same or different: Click all boxes with the answer 236 | |
215. | Same or different: Click all boxes with the answer 567 | |
216. | Same or different: Click all boxes with the answer 194 | |
217. | Same or different: Click all boxes with the answer 222 | |
218. | Same or different: Click all boxes with the answer 468 | |
219. | Same or different: Click all boxes with the answer 673 | |
220. | Thousands Takeaway: Write missing numbers in vertical subtraction of thousands numbers | |
221. | Thousands Takeaway: Write missing numbers in vertical subtraction of thousands numbers | |
222. | Thousands Takeaway: Write missing numbers in vertical subtraction of thousands numbers | |
223. | Thousands Takeaway: Write missing numbers in vertical subtraction of thousands numbers | |
224. | Thousands Takeaway: Write missing numbers in vertical subtraction of thousands numbers | |
225. | Take Hundreds:4421-?=3921,9365-500=?,5350-500=? | |
226. | Take Hundreds:48801-?=4840, 66150-300=?, 45685-700=? | |
227. | Take Hundreds:46250-?=45850, 69358-500= ?, 7419-600=? | |
228. | Take Hundreds:47210-?=46510,53296-800=?, 45258-400=? | |
229. | Take Hundreds: 42159-?=41859, 22014-500=?, 71119-600=? | |
230. | 50s Get Together: 1000 - ? = 750 | |
231. | 50s Get Together: 1000 - 850 =* | |
232. | 50s Get Together: 4250 - 650 =* | |
233. | 50s Get Together: * + 550 = 1000 | |
234. | 50s Get Together: 550 + ? = 1000 | |
235. | Give or Take a thousand | |
236. | Give or Take a thousand | |
237. | Give or Take a thousand | |
238. | Give or Take a thousand | |
239. | Give or Take a thousand | |
240. | Thousands crossing: 12009-12, 16005-9, 25006-15, | |
241. | Thousands crossing: 24001-6, 27004-10, 23002-22987 | |
242. | Thousands crossing: 22002-10, 19006-8, 41009-15 | |
243. | Thousands crossing: 42002-41992, 26013-25287, 37007-15 | |
244. | Uncle Bob's new car: New price less trade-in | |
245. | Wheeling Deal: New price less trade-in | |
246. | Mitchell moves up: New price less trade-in | |
247. | Dr Dan drives on: New price less trade-in | |
248. | Lord Percibald rides in style: New price less trade-in | |
249. | True or False?: 118 - 25 = 243 - 150 | |
250. | True or False?: 251 - 56 = 193 - 50 | |
251. | True or False?: 431 - 62 = 627 - 258 | |
252. | True or False?: 285 - 96 = 322 - 286 | |
253. | True or False?: 721 - 42 = 930 - 251 | |
254. | Same or different: Click all boxes with the same answer | |
255. | Same or different: Click all boxes with the same answer | |
256. | Same or different: Click all boxes with the same answer | |
257. | Same or different: Click all boxes with the same answer | |
258. | Same or different: Click all boxes with the same answer | |
259. | Thousands Takeaway: *42* - 4480 = 4**5 | |
260. | Thousands Takeaway: 673* - **41 = 39*9 | |
261. | Thousands Takeaway: *34* - 2375 = 5**8 | |
262. | Thousands Takeaway: 70** - *104 = 1*99 | |
263. | Thousands Takeaway: *04* - 27*9 = 1*21 | |
264. | 50s get together: 4000 - ? = 750 | |
265. | 50s get together: 6000 - ? = 650 | |
266. | 50s get together: 2000 - ? = 150 | |
267. | 50s get together: 1000 - 650 = ? | |
268. | 50s get together: 1000 - 450 = ? | |
269. | 50s get together: 8000 - 450 = ? | |
270. | 50s get together: ? - 150 = 1850 | |
271. | 50s get together: ? - 350 = 6650 | |
272. | 50s get together: ? - 850 = 4150 | |
273. | 50s get together: ? - 5350 = 650 | |
274. | Give or Take a Thousand 193051 - 3000 = ? | |
275. | Give or Take a Thousand 714320 - 5000 = ? | |
276. | Give or Take a Thousand 685531 - 2000 = ? | |
277. | Give or Take a Thousand 214990 - 5000 = ? | |
278. | Give or Take a Thousand 33750 - 3000 = ? | |
279. | Give or Take a Thousand 142301 - 6000 = ? | |
280. | Give or Take a Thousand 335771 - 8000 = ? | |
281. | Give or Take a Thousand 1524151 - 20000 = ? | |
282. | Give or Take a Thousand 1348159 - 10000 = ? | |
283. | Give or Take a Thousand 31486128 - 30000 = ? | |
284. | Give or Take a Thousand 13221 - 8000 = ? | |
285. | Give or Take a Thousand 12850 - 4000 = ? | |
286. | Give or Take a Thousand 31280 - 3000 = ? | |
287. | Give or Take a Thousand 25190 - 6000 = ? | |
288. | Give or Take a Thousand 14820 - 7000 = ? | |
289. | Golden Oldies: Age difference | |
290. | Fete accomplished: Money addition and subtraction | |
291. | Spot the difference: Write the difference between 612 and 588 | |
292. | Spot the difference: Write the difference between 315 and 291 | |
293. | Spot the difference: Write the difference between 708 and 687 | |
294. | Spot the difference: Write the difference between 475 and 395 | |
295. | Spot the difference: Write the difference between 117 and 95 | |
296. | True or False: 456-78=379 | |
297. | True or False: 631-82=549 | |
298. | True or False: 297=342-45 | |
299. | True or False: 186=237-52 | |
300. | True or False: 746-53=693 | |
301. | Same or Different - Click all the boxes where the answer is 84 | |
302. | Same or Different - Click all the boxes where the answer is 387 | |
303. | Same or Different - Click all the boxes where the answer is 792 | |
304. | Same or Different - Click all the boxes where the answer is 576 | |
305. | Same or Different - Click all the boxes where the answer is 264 | |
306. | Complementary add/sub: 8236-547=7689 | |
307. | Complementary add/sub: 2815-492=2323 | |
308. | Complementary add/sub: 5730-166=5564 | |
309. | Complementary add/sub: 1073-561=512 | |
310. | Complementary add/sub: 6923-784=6139 | |
311. | Give or Take a Hundred 562719-500 | |
312. | Give or Take a Hundred 276582-400 | |
313. | Give or Take a Hundred 618395-200 | |
314. | Give or Take a Hundred 45927-300 | |
315. | Give or Take a Hundred 75881-700 | |
316. | Taking the Big Ones: Write the missing numbers in vertical subtraction algorithms | |
317. | Taking the Big Ones: Write the missing numbers in vertical subtraction algorithms | |
318. | Taking the Big Ones: Write the missing numbers in vertical subtractions | |
319. | Taking the Big Ones: Write the missing numbers in vertical subtraction algorithms | |
320. | Taking the Big Ones: Write the missing numbers in vertical subtractions | |
321. | Driven to the edge: 1000-793 | |
322. | Growing pains - 1000-126 | |
323. | Pump up the volume - 3000-934 | |
324. | Taking stock - 1000-750 | |
325. | Thousands crossing: Add/subtract crossing a thousands bound | |
326. | Thousands crossing: Add/subtract crossing a thousands bound | |
327. | Thousands crossing: Add/subtract crossing a thousands bound | |
328. | Thousands crossing: Add/subtract crossing a thousands bound | |
329. | Thousands crossing: Add/subtract crossing a thousands bound | |
330. | True or false 153 - 72 = 225 | |
331. | True or false 180 - 25 = 215 | |
332. | True or false 60 - 120 = -60 | |
333. | True or false 420 - (-85) =515 | |
334. | True or false 120 - 250 = -130 | |
335. | N/D Find the mystery negative: Addition/subtraction of negative integers up to +/-100 | |
336. | N/D Find the mystery negative: Addition/subtraction of negative integers up to +/-100 | |
337. | N/D Find the mystery negative: Addition/subtraction of negative integers up to +/-100 | |
338. | N/D Find the mystery negative: Addition/subtraction of negative integers up to +/-100 | |
339. | N/D Find the mystery negative: Addition/subtraction of negative integers up to +/-100 | |
340. | N/D Find the mystery negative: Addition/subtraction of negative integers up to +/-100 | |
341. | N/D Find the mystery negative: Addition/subtraction of negative integers up to +/-100 | |
342. | N/D Find the mystery negative: Addition/subtraction of negative integers up to +/-100 | |
343. | N/D Find the mystery negative: Addition/subtraction of negative integers up to +/-100 | |
344. | N/D Find the mystery negative: Addition/subtraction of negative integers up to +/-100 | |
345. | Same or different: Click all the boxes with the same answer | |
346. | Same or different: Click all the boxes with the same answer | |
347. | Same or different: Click all the boxes with the same answer | |
348. | Same or different: Click all the boxes with the same answer | |
349. | Same or different: Click all the boxes with the same answer | |
350. | Give or take a thousand: 257908 - 160000 | |
351. | Give or take a thousand: 135001 - 34000 | |
352. | Give or take a thousand: 106095 - 29000 | |
353. | Give or take a thousand: 236401 - 195401 | |
354. | Give or take a thousand: 182356 - 127356 | |
355. | Give or take a thousand: 262141 - 245141 | |
356. | Give or take a thousand: 120068 - 88068 | |
357. | Give or take a thousand: 86215 - 7000 | |
358. | Give or take a thousand: 13553 - 8000 | |
359. | Give or take a thousand: 842908 - 74000 | |
360. | Taking the Big Ones: Write the missing numbers in vertical subtraction algorithms | |
361. | Taking the Big Ones: Write the missing numbers in vertical subtraction algorithms | |
362. | Taking the Big Ones: Write the missing numbers in vertical subtraction algorithms | |
363. | Taking the Big Ones: Write the missing numbers in vertical subtraction algorithms | |
364. | Taking the Big Ones: Write the missing numbers in vertical subtraction algorithms | |
365. | Spot the difference: 4550 - 2150 | |
366. | Spot the difference: 6600 - 3650 | |
367. | Spot the difference: 5750 - 2550 | |
368. | Spot the difference: 9350 - 5450 | |
369. | Spot the difference: 2600 - 8700 | |
370. | Spot the difference: 8400 - 3500 | |
371. | Spot the difference: 3150 - 1500 | |
372. | Negatively speaking: -2 +(-4) - * = 10 | |
373. | Negatively speaking: - 4 + 5 - * = 10 | |
374. | Negatively speaking: -8 +7 - * = 10 | |
375. | Negatively speaking: -6 - 1 - * = 10 | |
376. | Negatively speaking: -16 +25 - * = 10 | |
377. | True/false: 128-64=145-81 | |
378. | True/false: 154-72=172-90 | |
379. | True/false: 136-61=125-50 | |
380. | True/false: 143-76=131-65 | |
381. | True/false: 154-94=121-51 | |
382. | N/D Find the mystery negative!: Subtraction with single-digit negative integers | |
383. | N/D Find the mystery negative!: Subtraction with single-digit negative integers | |
384. | N/D Find the mystery negative!: Subtraction with single-digit negative integers | |
385. | N/D Find the mystery negative!: Subtraction with single-digit negative integers | |
386. | N/D Find the mystery negative!: Subtraction with single-digit negative integers | |
387. | N/D Find the mystery negative!: Subtraction with single-digit negative integers | |
388. | N/D Find the mystery negative!: Subtraction with single-digit negative integers | |
389. | N/D Find the mystery negative!: Subtraction with single-digit negative integers | |
390. | N/D Find the mystery negative!: Subtraction with single-digit negative integers | |
391. | N/D Find the mystery negative!: Subtraction with single-digit negative integers | |
392. | N/D Find the mystery negative!: Subtraction with single-digit negative integers | |
393. | N/D Find the mystery negative!: Subtraction with single-digit negative integers | |
394. | Subtracting big ones: Write missing numbers in vertical subtractions | |
395. | Subtracting big ones: Write missing numbers in vertical subtractions | |
396. | Subtracting big ones: Write missing numbers in vertical subtractions | |
397. | Subtracting big ones: Write missing numbers in vertical subtractions | |
398. | Subtracting big ones: Write missing numbers in vertical subtractions | |
399. | Lord Percibald improves: Money calculations | |
400. | Write the missing number: 20= -10, 17, ? | |
401. | Write the missing number: 20=-45, 30, ? | |
402. | Write the missing number: 20= -15, 25, ? | |
403. | Write the missing number: 20= -18, -24, ? | |
404. | Write the missing number: 20= -8, -2, ? | |
405. | T/F 8745-3690=5055 | |
406. | T/F 4917-2380=2637 | |
407. | Find the Mystery Number 176- * =-190 | |
408. | Find the Mystery Number 384- * =407 | |
409. | Find the Mystery Number -769- * =-732 | |
410. | Find the Mystery Number 245- * =263 | |
411. | T/F 418-384=22+12 | |
412. | T/F 568-519=23+26 | |
413. | T/F 882-831=36+16 | |
414. | T/F 19+14=278-245 | |
415. | Time travels: Calculate dates BC | |
416. | Spot the Difference: Calculate the difference between number pairs incl negative integers | |
417. | Spot the Difference: Calculate the difference between number pairs incl negative integers | |
418. | Spot the Difference: Calculate the difference between number pairs incl negative integers | |
419. | Spot the Difference: Calculate the difference between number pairs incl negative integers | |
420. | Spot the Difference: Calculate the difference between number pairs incl negative integers | |
421. | Spot the Difference: Calculate the difference between number pairs incl negative integers | |
422. | Spot the Difference: Calculate the difference between number pairs incl negative integers | |
423. | Spot the Difference: Calculate the difference between number pairs incl negative integers | |
424. | Take it away: Subtraction with decomposition | |
425. | Take it away: Subtraction with decomposition | |
426. | Take it away: Subtraction with decomposition | |
427. | Water watch: Volume multiplication and subtraction | |
428. | Health times: Multiplication of liquid measurements | |
429. | Bus Times: Multiply distances | |
430. | Number Quest - complete number sentence | |
431. | Mega-sum-a-saurus - complete missing digits to make number sentence | |
432. | Mega-sum-a-saurus - complete missing digits to make number sentence | |
433. | Mega-sum-a-saurus - complete missing digits to make number sentence | |
434. | Mega-sum-a-saurus - complete missing digits to make number sentence | |
435. | Mega-sum-a-saurus - complete missing digits to make number sentence | |
436. | Astro Al's Arithmagon - triangle number puzzle | |
437. | Enid the Elephant's Equations - equivalent to 9 + 5 | |
438. | Enid the Elephant's Equations - equivalent to 8 + 7 | |
439. | Mega-sum-a-saurus - complete missing digits to make number sentence | |
440. | Mega-sum-a-saurus - complete missing digits to make number sentence | |
441. | Here Comes The Bride... - find sum of sequence | |
442. | Too Much Information! - identify unnecessary information | |
443. | Too Much Information! - identify unnecessary information | |
444. | Natural Numbers - sum of 1st 13 Fibonacci numbers | |
445. | Natural Numbers - sum of 1st 16 Fibonacci numbers | |
446. | Out of Phase 1 - number of days between given dates |