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.