Use and record a range of mental strategies to solve addition and subtraction problems involving one- and two-digit numbers, including:counting on from the larger number to find the total of two numbers, counting back from a number to find the number rema

1. 2 less, 2 more than 4
2. 2 less, 2 more than 12
3. 2 less, 2 more than 16
4. 2 less, 2 more than 9
5. 2 less, 2 more than 11
6. Which number is 10 more than 14?
7. 2 less, 2 more than 28
8. 2 less, 2 more than 15
9. 2 less, 2 more than 23
10. 2 less, 2 more than 13
11. Changing numbers: 36 to 39
12. Changing Numbers: 24 to 21
13. Changing Numbers: 66 to 76
14. Changing Numbers: 80 to 78
15. Changing Numbers: 50 to 45
16. Changing Numbers: 35 to 40
17. Changing Numbers: 10 to 15
18. Changing Numbers: 20 to 30
19. Changing Numbers: 45 to 35
20. Changing Numbers: 90 to 100
21. Changing Numbers: 85 to 80
22. Changing Numbers: 45 to 50
23. Changing Numbers: 99 to 100
24. Changing Numbers: 24 to 14
25. Changing Numbers: 85 to 80
26. Changing Numbers: 48 to 50
27. Up We Go - Start at 3. Add 4 more.
28. Up We Go - Start at 2. Add 4 more.
29. Up We Go - Start at 6. Add 2 more.
30. Up We Go - Start at 5. Add 2 more.
31. Up we go - What is 5 plus 3?
32. Up we go - What is 3 + 2?
33. Up we go - 4 add 2
34. 20s Zone - 4 more than 22
35. 20s Zone - 4 more than 21
36. 20s Zone - 3 more than 24
37. Addition chain: 4 + 1 = 5, 5 + 2 = ?
38. Addition chain: 2 + 2 = 4, 4 + 1 = ?
39. Addition chain: 3 + 2 = 5, 5 + 1 = ?
40. Teens zone: 7 more than 8
41. Teens zone: 2 more than 9
42. Word Wise: The sum of 10 and 4
43. Word Wise: Add 1 and 12
44. Word Wise: Add 5 to 7
45. Word Wise: 7 plus 6
46. Word Wise: 8 plus 3
47. Word Wise: 7 plus 4
48. Use the Pattern: 4+3, +4, +5
49. 20s Zone: 16 + 4 = ?, 16 + 6 = ?
50. 20s Zone: 18 + 2 = ?, 18 + 5 = ?
51. Addition Chain: 5 + 3 = ? + 3 = ?
52. Addition Chain: 6 + 4 = ? + 5 = ?
53. Addition Chain: 2 + 4 = ? + 5 = ?
54. Addition Chain: 3 + 9 = ? + 1 = ?
55. Addition Chain: 4 + 3 = ? + 5 = ?
56. Use the Pattern: 4+0, +10, +20
57. Use the Pattern: 5+0, +10, +20
58. Use the Pattern: 7+0, +10, +20
59. Use the Pattern: 6+0, +10, +20
60. Use the Pattern: 3+0, +10, +20
61. Use the Pattern: 9+0, +10, +20
62. Is the answer...?: Click all boxes with answer 8.
63. Is the answer...?: Click all boxes with answer 12
64. Is the answer...?: Click all boxes with answer 14
65. Is the answer...?: Click all boxes with answer 11
66. Is the answer...?: Click all boxes with answer 15
67. Is the answer...?: Click all boxes with answer 13
68. Changing Numbers: 24 to 34
69. Changing Numbers: 25 to 26
70. Changing Numbers: 17 to 21
71. Changing Numbers: 10 to 21
72. Changing Numbers: 7 to 11
73. Changing Numbers: 8 to 13
74. Changing Numbers: 9 to 12
75. Changing Numbers: 17 to 21
76. Changing Numbers: 18 to 21
77. Changing Numbers: 27 to 31
78. Changing Numbers: 24 to 28
79. Changing Numbers: 29 to 39
80. Changing Numbers: 30 to 50
81. Changing Numbers: 48 to 50
82. 30s Zone: 4 more than 28
83. 30s Zone: 7 more than 25
84. 30s Zone: 5 more than 29
85. 30s Zone: 9 more than 29
86. Use the Pattern: 5+4,15+4,25+4
87. Use the Pattern: 6+4,16+4,26+4
88. Use the Pattern: 10+2,20+2,30+2
89. Thrilling Thirties: 3 more than 29
90. Thrilling Thirties: Five more than twenty-seven
91. Thrilling Thirties: 4 more than 28
92. Thrilling Thirties: 5 more than 26
93. Thrilling Thirties: 4 plus 29
94. Fabulous Forties: 4 more than 38
95. Fabulous Forties: 6 plus 37
96. Fabulous Forties: 5 more than 39
97. Fabulous Forties: 6 plus 36 = ?
98. Fabulous Forties: 4 more than 37 = ?
99. Word Wise: 15 added to 6
100. Beyond 30 - 4 more than 38
101. Double Up and Add: Double 6 plus 4
102. Double Up and Add: Double 10 plus 7
103. Double Up and Add: Double 9 plus 2
104. Same or Different: Click all the boxes with the answer 28.
105. Three Up!: Add 3 to 60, 20, 50
106. Two Up!!: Add 2 to 23, 15, 37
107. Two Up!!: Add 2 to 29, 80, 12
108. Two Up!!: Add 2 to 14, 24, 44
109. One Up!: Add 1 to 65, 19, 42
110. Changing numbers: 24 changes to 33
111. Changing numbers: 19 changes to 28
112. Changing numbers: 13 changes to 21
113. Changing numbers: 9 changes to 17
114. Changing numbers: 8 changes to 17
115. Happy Landings 6 - 3
116. Happy Landings 5 minus 3
117. Happy Landings 4 - 3
118. Happy landings 9 take away 3
119. Happy Landings 9 minus 6
120. Happy landings 10 take away 2
121. Subtraction chain 8 - 4 = 4, 4 - 2 = ?
122. Subtraction chain 7 - 2 = 5, 5 - 2 = ?
123. Subtraction chain 9 - 3 = 6, 6 - 2 = ?
124. Subtraction chain 6 - 3 = 3, 3 - 1 = ?
125. Subtraction chain 8 - 2 = 6, 6 - 1 = ?
126. Happy Landings 8 minus 5
127. Happy Landings Take 4 from 9
128. Happy Landings 8 Take away 4
129. Subtraction chain 9 - 1 = 8, 8 - 2 = ?
130. Subtraction chain 8 - 3 = 5, 5 - 2 = ?
131. Subtraction chain 6 - 2 = 4, 4 - 2 = ?
132. Subtraction chain 7 - 3 = 4, 4 - 1 = ?
133. Subtraction chain 9 - 2 = 7, 7 - 3 = ?
134. Crossing 10: Add 7 to 8
135. Crossing 10: 14-4; 14-7=?
136. Crossing 10: Add 5 to 8
137. Crossing 10: Add 5 to 9
138. Crossing 10: Add 9 to 6
139. Crossing 10: 14-4; 10-7=?
140. Crossing 10: 13-3; 10-9=?
141. Crossing 10: 17-7; 17-9=?
142. Crossing 10: Add 8 to 5
143. Crossing 10: Add 9 to 9.
144. Hide and Seek: 7 trolls - 5
145. Hide and Seek: 7 trolls - 4
146. Hide and Seek: 6 trolls - 4
147. Hide and Seek: 8 trolls - 4
148. 7 Clocks: How many more to make 15?
149. 9 Cars: How many more to make 16?
150. Number detectives: 14 - 6 = ?
151. Number detectives: 15 - 9 = ?
152. Number detectives: 11 - 8 = ?
153. Number detectives: 13 - 5 = ?
154. Number detectives: 15 - 13 = ?
155. Party time: 17 - 9
156. Party time: 16 - 9
157. Party time: 19 - 9
158. Party time: 18 - 9
159. Party time: 12 - 9
160. Party time: 11 - 9
161. Party time: 10 - 9
162. Party time: 9 - 9
163. Party time: 15 - 9
164. Find the first number: ? count on 5 = 8
165. Find the first number: ? count on 1 = 8
166. Find the first number: ? count on 2 = 8
167. Find the first number: ? count back 1 = 8
168. Find the first number: ? count back 2 = 8
169. Find the first number: ? count back 3 = 8
170. Find the first number: ? count back 4 = 8
171. Find the first number: ? count on 3 = 8
172. Find the first number: ? count on 4 = 8
173. Card games: Which is lower, 4 + 2 or 6 + 1?
174. Card games: Which is lower, 7 + 3 or 5 + 4?
175. Card games: Which is lower, 6 + 4 or 2 + 3?
176. Card games: Which is lower, 4 + 3 or 1 + 9?
177. Card games: Which is higher, 4 + 5 or 5 + 1?
178. Which number is 10 less than 20?
179. Which number is 10 less than 50?
180. Number detectives 18 -10 = ?
181. Word Wise: Subtract 14 from 20
182. Word Wise: Subtract 5 from 19
183. Word Wise: Subtract 4 from 17
184. Word Wise: Subtract 9 from 20
185. Word Wise: 17 take away 6
186. Word Wise: 19 take away 9
187. Word Wise: 20 take away 11
188. Word Wise: 14 take away 6
189. Word Wise: 11 less than 19
190. Word Wise: 13 less than 20
191. Word Wise: 6 less than 12
192. Word Wise: 11 less than 16
193. Use the pattern: 8 - 4, - 3, - 2
194. Use the pattern: 6 - 6, - 5, - 4
195. Slippery fish 9 - 9 = ?
196. Slippery fish 14 - 8 = ?
197. Slippery fish 18 - 12 = ?
198. Slippery fish 12 - 3 = ?
199. Slippery fish 15 - 10 = ?
200. Slippery fish 10 - 9 = ?
201. Slippery fish 11 - 7 = ?
202. Changing numbers: 18 to 9
203. Changing numbers: 16 to 12
204. Changing numbers: 12 to 7
205. Changing numbers: 20 to 9
206. Changing numbers: 14 to 9
207. The 20s zone: 24 - 4 = ?, 24 - 7 = ?
208. Take 10: 40 - 10 = ?
209. Subtraction chain 20 - 3 = 17, 17 - 3 = ?
210. Subtraction chain 20 - 6 = 14, 14 - 5 = ?
211. Subtraction chain 20 - 5 = 15, 15 - 2 = ?
212. Subtraction chain 20 - 9 = 11, 11 - 3 = ?
213. Word Wise!: Subtract 13 from 20
214. Word Wise!: Subtract 15 from 20
215. Word Wise!: Subtract 8 from 20
216. Word Wise!: Subtract 11 from 20
217. Word Wise!: Subtract 17 from 20
218. Word Wise!: Subtract 5 from 20
219. Word Wise!: 12 minus 7
220. Word Wise!: 20 take away 4
221. Word Wise!: 20 take away 7
222. Word Wise!: 19 less than 19
223. Word Wise!: 3 less than 20
224. Word Wise!: 10 less than 20
225. Hide and seek: 10 trolls - 5
226. Hide and seek: 14 trolls - 5
227. Hide and seek: 11 trolls - 5
228. Slippery fish 16 - 7
229. Subtraction Chain - 27-20-13
230. Subtraction Chain - 28-7=21-5=?
231. Subtract 8 (from 16, 15, 12)
232. Subtract 6 (from 12, 11, 13)
233. Subtract 5 (from 14, 11, 8)
234. Subtract 7 (from 14, 16, 11)
235. Subtract 4 (from 10, 12, 8)
236. Use the pattern 16-4=? 26-3=?, 36-4=?
237. Use the pattern 14-3=? 24-3=?, 34-3=?
238. Use the pattern 15-3=? 25-3=?, 35-3=?
239. Use the pattern 18-5=? 28-5=?, 38-5=?
240. Subtract 8 from 17, 13 & 11
241. Subtract 6 from 13, 15 & 11
242. Subtract 7 from 24, 22 & 25
243. Subtract 5 from 21, 20 & 24
244. Subtract 9 from 12, 15 & 17
245. 8 Spaces to Park: 4 cars. How many more cars can fit?
246. 8 spaces to park: 8 - 4
247. 8 spaces to park: 8 - 6
248. 8 spaces to park: 8 - 7
249. 8 spaces to park: 8 - 5
250. 8 Spaces to Park: 5 cars. How many more cars can fit?
251. 8 Spaces to Park: 6 cars. How many more cars can fit?
252. 8 Spaces to Park: 7 cars. How many more cars can fit?
253. Birds flock together 3 + 2 = ?
254. Birds flock together 6 + 2 = ?
255. Birds flock together 1 + 7 = ?
256. Birds flock together 4 + 4 = ?
257. Birds flock together 5 + 3 = ?
258. Card games: 6 + 4 = ?, 2 + 3 = ?
259. Card games: 7 + 4 = ?, 9 + 8 = ?
260. Card games: 7 + 9 = ?, 8 + 3 = ?
261. Card games: 5 + 8 = ?, 7 + 9 = ?
262. Card games: 9 + 9 = ?, 8 + 6 = ?
263. The 20s zone: 28 - 8 = ?, 28 - 9 = ?
264. The 20s zone: 23 - 3 = ?, 23 - 4 = ?
265. The 20s zone: 26 - 6 = ?, 26 - 8 = ?
266. Card games: Which is higher, 5 + 4 or 3 + 7?
267. Card games: Which is higher, 3 + 5 or 4 + 8?
268. Card games: Which is higher, 5 + 9 or 6 + 4?
269. Card games: Which is higher, 4 + 6 or 9 + 3?
270. Card games: Which is lower, 9 + 3 or 6 + 7?
271. Card games: Which is lower, 2 + 6 or 4 + 2?
272. The 20s Zone: Add 6 to 18
273. The 20s Zone: Add 5 to 16
274. The 20s Zone: Add 7 to 15
275. Teen Zone: Add 9 to 7
276. Teen Zone: Take 8 from 15
277. Teen Zone: Take 7 from 16
278. Teen Zone: Take 5 from 13
279. Teen Zone: Take 7 from 14
280. Teen Zone: Take 9 from 17
281. Teen Zone: Take 7 from 12
282. Teen Zone: Take 8 from 15
283. Teen Zone: Take 8 from 15
284. Teen Zone: Add 5 to 7
285. The 20s Zone: Add 7 to 17
286. Teen Zone: Take 7 from 15
287. Teen Zone: Take 9 from 16
288. Teen Zone: Take 9 from 18
289. Teen Zone: Take 11 from 17
290. Teen Zone: Take 9 from 14
291. Teen Zone: Add 6 to 6
292. The 20s Zone: Add 6 to 17
293. The 20s Zone: Add 6 to 15
294. The 20s Zone: Add 6 to 19
295. Teen Zone: Add 8 to 7
296. Crossing 10: Take 8 from 17
297. Crossing 10: Take 9 from 17
298. Crossing 10: Take 9 from 13
299. Crossing 10: Take 9 from 15
300. Crossing 10: Take 9 from 14
301. Crossing 10: Take 8 from 13
302. Crossing 10: Take 7 from 14
303. The 20s Zone: Take 6 from 24
304. The 20s Zone: Take 8 from 24
305. The 20s Zone: Take 6 from 25
306. The 20s Zone: Take 4 from 21
307. The 20s Zone: Take 8 from 25
308. The 20s Zone: Take 9 from 23
309. The 20s Zone: Take 7 from 23
310. The 20s Zone: Take 8 from 26
311. The 20s Zone: Take 7 from 22
312. The 20s Zone: Take 8 from 27
313. Count back: Start at 16. Count back 5
314. 9 Clocks: How many more to make 15?
315. 5 Clocks: How many more to make 15?
316. 7 Cars: How many more to make 16?
317. Card Tricks: Red 3 + Black 7