Apply known single-digit addition and subtraction facts to mental strategies for addition and subtraction of two-, three- and four-digit numbers, including:the jump strategy on an empty number line, the split strategy, the compensation strategy, using pat

1. Changing Numbers: 100 to 200
2. Changing Numbers: 265 to 255
3. Changing Numbers: 550 to 650
4. Changing Numbers: 300 to 299
5. Changing Numbers: 888 to 898
6. Changing Numbers: 428 to 438
7. Changing Numbers: 204 to 194
8. Changing Numbers: 402 to 412
9. Changing Numbers: 399 to 499
10. Changing Numbers - 45 to 145
11. Changing Numbers - 235 to 225
12. Changing Numbers - 990 to 890
13. Changing Numbers - 576 to 577
14. Changing Numbers - 36 to 136
15. Changing Numbers - 455 to 555
16. 1000 less, 1000 more than 4215
17. 1000 less, 1 more than 7999
18. 1000 less, 1000 more than 3690
19. Changing Numbers - 2458 to 2558
20. Changing Numbers - 9906 to 9996
21. Changing Numbers - 7899 to 7909
22. Changing Numbers - 4323 to 4423
23. Changing Numbers - 8999 to 9000
24. 1000 less, 100 more than 4035
25. 1000 less, 100 more than 1000
26. 1000 less, 1000 more than 1900
27. 100 less, 1000 more than 1795
28. 1000 less, 10 more than 8712
29. 1000 less, 100 more than 6995
30. 100 less, 1 more than 5999
31. 1000 less, 1 more than 8799
32. 100 less, 1000 more than 5000
33. 1 less, 1000 more than 8000
34. Changing Numbers - 1040 to 1140
35. Changing Numbers - 820 to 1820
36. 1000 less, 100 more than 6793
37. 1000 less, 1 more than 3589
38. Add these 3 numbers: 14 + 5 + 2
39. Add these 3 numbers: 11 + 4 + 5
40. Add these 3 numbers: 13 + 7 + 6
41. Same or Different? Click all boxes with answer 20
42. Adding tens: 42 + 10 = ?
43. Adding tens: 38 + 20 = ?
44. Adding tens: 56 + 30 = ?
45. Changing numbers 136 to 140
46. Changing numbers 122 to 130
47. Changing numbers 154 to 160
48. Changing numbers 188 to 190
49. Changing numbers 177 to 180
50. Add three numbers: 14 + 7 + 3
51. Add three numbers: 20 + 10 + 20
52. 40s zone: Add on 5 to 36.
53. 40s zone: 4 more than 38
54. 40s zone: 37 plus 5
55. 40s zone: 4 more than 39
56. 40s zone: Add on 3 to 38
57. 50s zone: Add on 5 to 47.
58. 50s zone: 49 plus 3
59. 50s zone: 48 plus 5
60. 50s zone: 4 more than 47
61. 50s zone: 5 more than 46
62. Number Detectives: 10 + 20 = ?
63. Use the pattern: 2+4, 12+4, 120 + 40
64. Use the pattern: 4+1, 14+1, 140+10
65. Use The Pattern: 4+3, 14+3, 140+30
66. Use The Pattern: 2+7, 12+7, 120+70
67. Use The Pattern: 5+4, 15+4, 150+40
68. Use The Pattern: 3+6, 13+6, 130+60
69. Use The Pattern: 5+3, 15+3, 150+30
70. Beyond 20: What is 6 more than 29?
71. Beyond 50: What is 4 more than 57?
72. Beyond 70: What is 8 more than 78?
73. Beyond 30: What is 4 more than 38?
74. Beyond 60: What is 5 more than 68?
75. Addition Chains: 10 + 4 + 6 + 2, 11 + 2 + 3 + 4
76. Addition Chains: 4 + 5 + 5 + 2, 10 + 5 + 5 + 10
77. Addition Chains: 3 + 2 + 4 + 2, 7 + 2 + 3 + 4
78. Add three numbers: 14 + 12 + 8
79. Crossing 100: 4 more than 99
80. Crossing 100: 7 more than 97
81. Crossing 100: 8 more than 98
82. Crossing 100: 9 more than 92
83. Crossing 100: 5 more than 97
84. Same or Different: Click all the boxes with the answer 50.
85. Same or Different: Click all the boxes with the answer 46.
86. Same or Different: Click all the boxes with the answer 32.
87. Same or Different: Click all the boxes with the answer 45.
88. Same or Different: Click all the boxes with the answer 38.
89. Beyond 40: 6 more than 45
90. Beyond 70: 5 more than 79
91. Beyond 60: 8 more than 68
92. Beyond 50: 7 more than 58
93. Beyond 70: 9 more than 72
94. Changing Numbers 29 to 34
95. Changing Numbers 67 to 78
96. Changing Numbers 98 to 101
97. Changing Numbers 87 to 92
98. Changing Numbers 59 to 63
99. Changing Numbers 96 to 101
100. Changing Numbers 98 to 105
101. Changing Numbers 97 to 103
102. Changing Numbers 97 to 102
103. Changing Numbers 99 to 103
104. Changing Numbers 42 to 62
105. Changing Numbers 63 to 93
106. Changing Numbers 14 to 54
107. Changing Numbers 137 to 157
108. Changing Numbers 35 to 85
109. Number detectives 235+6 = *
110. Number detectives 98+7=*
111. Use The Pattern 3+5 30+50 300+500
112. Use The Pattern 3+6 30+60 600+300
113. Use The Pattern 2+4 20+40 200+400
114. Use The Pattern 3+2 30+20 200+300
115. Use The Pattern 6+2 60+20 600+200
116. Addition Chains 21 + 3 + 6 + 5, 60 + 4 + 3 + 2
117. Addition Chains 33 + 4 + 10 + 5, 28 + 3 + 9 + 8
118. Addition Chains 23 + 5 + 4 + 9, 60 + 8 + 3 + 10
119. Addition Chains 95 + 4 + 2 + 12, 94 + 3 + 3 + 7
120. Addition Chains 100 + 5 + 5 + 7, 99 + 3 + 6 + 2
121. Beyond 90: 98 + 4
122. Beyond 100: 104 + 7
123. Beyond 110: 119+3
124. Beyond 120: 128+6
125. Beyond 130: 139 + 5
126. Changing numbers: 12 + 10, +11, +111
127. Changing numbers: 28 + 10, +11, +111
128. Changing numbers: 49 + 10, +11, +111
129. Changing numbers: 88 + 10, +11, +111
130. Changing numbers: 29 + 10, +11, +111
131. Number Detectives: 100 Pairs 63 + 37 = ?
132. Use the pattern: 6+3, 60+30, 600+300
133. Use the pattern: 2+4, 20+40, 200+400
134. Use the pattern: 2+6, 20+60, 200+600
135. Use the pattern: 4+9, 40+90, 400+900
136. Use the pattern: 1+7, 10+70, 100+700
137. Adding Tens: 416 + 50 = *
138. Adding Tens: 542 + 50 = *
139. Add Hundreds: 500+246
140. Add Hundreds: 100+280
141. Add Hundreds: 300+453
142. Add Hundreds: 200+43
143. Add Hundreds: 800+163
144. Mystery number: 106+11=?
145. Mystery number: 514+12=?
146. Mystery number: 913+13=?
147. Mystery number: 711+17=?
148. Mystery number: 133+16=?
149. Use the pattern: 5+2,50+20, 500+200=?
150. Use the pattern: 5+4,50+40, 500+400=?
151. Use the pattern: 7+1,70+10, 700+100=?
152. Use the pattern: 2+3,20+30, 200+300=?
153. Use the pattern: 3+8,30+80, 300+800=?
154. Same or different:19-12,2+5,3+4,33-26,16-8
155. Same or different:13-4,6+3,12-5,19-8,32-23
156. Same or different:44-8,14+23,22+18,19+17,54-18
157. Same or different:43-7,21+17,13+22,18+16,53-17
158. Same or different:13+6,34-15,43-25,32-13,58-37
159. Adding Tens: 235+50 =?
160. Adding Tens: 338+50=?
161. Adding Tens: 562+30=?
162. Taking tens: 40 - 30 = ?
163. Taking tens: 50 - 20 = ?
164. Taking tens: 80 - 40 = ?
165. Taking tens: 70 - 10 = ?
166. Taking tens: 70 - 40 = ?
167. Taking tens: 40 - 30 = ?
168. Subtraction Chain - 29-8=21-3=?
169. Subtraction Chain - 26-5=21-4=?
170. Use the pattern: 10, 20 & 80 - 5 = ?
171. Use the pattern: 10, 20 & 40 - 3 = ?
172. Use the pattern: 10, 20 & 90 - 7 = ?
173. Use the pattern: 10, 20 & 50 - 4 = ?
174. Use the pattern: 10, 20 & 30 - 8 = ?
175. Taking ten: 46-10
176. Taking ten: 72-10
177. Taking ten: 39-10
178. Taking ten: 55-10
179. Taking ten: 81-10
180. Use the pattern 16-7=? 26-7=?, 36-7=?
181. Use the pattern 13-6=? 23-6=?, 33-6=?
182. Use the pattern 11-5=? 21-5=?, 31-5=?
183. Use the pattern 12-9=? 22-9=?, 32-9=?
184. Use the pattern 19-4=? 29-4=?, 39-4=?
185. Use the pattern 17-8=? 27-8=?, 37-8=?
186. Same Difference - Difference between 10 and 40.
187. Number detectives: 30 - 14 = ?
188. Use the pattern: 9-5, 90-50, 900-500
189. Use the pattern: 8-5, 80-50, 800-500
190. Use the pattern: 6-2, 60-20, 600-200
191. Use the pattern: 9-8, 90-80, 900-800
192. Use the pattern: 5-3, 50-30, 500-300
193. Use the pattern: 8-2, 80-20, 800-200
194. Count Down: 6 less than 41
195. Count Down: 7 less than 52
196. Count Down: 3 less than 42
197. Count Down: 6 less than 43
198. Count Down: 8 less than 47
199. Taking Tens: 44 - 20
200. Taking Tens: 68 - 30
201. Taking Tens: 98 - 50
202. Taking Tens: 32 - 20
203. Taking Tens: 59 - 40
204. Taking Tens: 87 - 20
205. Taking Tens: 72 - 40
206. Subtract.chains 48 - 7 - 2 - 9, 35 - 4 - 3 - 8
207. Subtract.chains 47 - 4 - 3 - 7, 28 - 8 - 2 - 5
208. Subtract.chains 23 - 4 - 1 - 3, 36 - 5 - 2 - 6
209. Subtract.chains 32 - 4 - 7 - 4, 45 - 2 - 10 - 5
210. Subtract.chains 28 - 5 - 2 - 10, 50 - 5 - 3 - 2
211. Spot the difference: 102 & 97, 27 & 19, 100 & 60
212. Changing Numbers 55-37=?
213. Changing Numbers 65-54=?
214. Changing Numbers 48-22=?
215. Changing Numbers 36-16=?
216. Changing Numbers 51-28=?
217. Changing Numbers 42-32=?
218. Number Detectives: 30 - 17 = ?
219. Number Detectives: 30 - 14 = ?
220. Count down 52-4=?
221. Count down 43-6=?
222. Count down 61-5=?
223. Count down 36-8=?
224. Count down 72-7=?
225. Count down 94-9=?
226. Take Ten 42 - 10
227.