ACMNA029

Explore the connection between addition and subtraction

1. Changing Numbers: 48 to 47
2. Changing Numbers: 27 to 29
3. Changing Numbers: 68 to 58
4. Changing Numbers: 90 to 85
5. Changing Numbers: 66 to 76
6. Changing Numbers: 10 to 15
7. Changing Numbers: 20 to 30
8. Changing Numbers: 45 to 35
9. Changing Numbers: 90 to 100
10. Changing Numbers: 85 to 80
11. Changing Numbers: 45 to 50
12. Changing Numbers: 99 to 100
13. Changing Numbers: 24 to 14
14. Changing Numbers: 85 to 80
15. Changing Numbers: 48 to 50
16. Changing Numbers: 324 to 314
17. Changing Numbers: 562 to 662
18. Changing Numbers: 500 to 510
19. Changing Numbers: 444 to 445
20. Changing Numbers: 265 to 255
21. Changing Numbers: 300 to 299
22. Changing Numbers: 888 to 898
23. Changing Numbers: 428 to 438
24. Changing Numbers: 204 to 194
25. Changing Numbers: 402 to 412
26. Changing Numbers: 399 to 499
27. Changing Numbers - 45 to 145
28. Changing Numbers - 235 to 225
29. Changing Numbers - 990 to 890
30. Changing Numbers - 576 to 577
31. Changing Numbers - 36 to 136
32. Changing Numbers - 455 to 555
33. Make 20: 7+4+?
34. Make 20: 11+5+?
35. Make 20: 8+9+?
36. Number Detectives: 10 + ? = 34
37. Make 50: 20+10+?
38. Number detectives: Mysteries of 15
39. Number detectives: Mysteries of 16
40. Number detectives: Mysteries of 17
41. Number detectives: Mysteries of 14
42. Addition Chains
43. Addition Chains
44. Addition Chains
45. Addition Chains
46. Addition Chains
47. Make 30: 10 + 11 + ? = 30
48. Make 30: 19 + 2 + ? = 30
49. Make 30: 20 + 10 + ? = 30
50. Make 30: 16 + 4 + ? = 30
51. Make 30: 20 + 7 + ? = 30
52. Make 30: 18 + 3 + ? = 30
53. Changing numbers: 24 changes to 33
54. Changing numbers: 19 changes to 28
55. Changing numbers: 13 changes to 21
56. Changing numbers: 9 changes to 17
57. Changing numbers: 8 changes to 17
58. Number Detectives: ? + 7 = 30
59. Number Detectives: ? + 24 = 30
60. Number Detectives: 22 + ? = 30
61. Number Detectives: 21 + ? = 30
62. Make 50: 40 + 4 + ?
63. Make 36: 20 + 14 + ?
64. Make 39: 30 + 6 + ?
65. Make 37: 12 + 20 + 5
66. Make 34: 10 + 22 + ?
67. Number detectives: 30+?, 50+?, 60+? =100
68. Addition Chains: 10 + 4 + 6 + 2, 11 + 2 + 3 + 4
69. Addition Chains: 4 + 5 + 6 + 8, 11 + 4 + 3+ 7
70. Addition Chains: 3 + 2 + 4 + 8, 4 + 3 + 7 + 4
71. Number detectives: ? + 9 = 49
72. Number detectives: ? + 11 = 53
73. Number detectives: 35+? = 46
74. Make 50: 39+7+? = 50
75. Make 50: 39+5+? = 50
76. Make 50: 35+5+? = 50
77. Make 50: 38+10+? = 50
78. Make 50: 42+6+? = 50
79. N/D Mysteries of 40! 34+? 30+? 38+?=40
80. N/D Mysteries of 40! 31+? 36+? 30+?=40
81. N/D Mysteries of 40! 33+? 37+? 32+?=40
82. N/D Mysteries of 40! 32+? 39+? 34+?=40
83. N/D Mysteries of 40! 31+? 35+? 37+?=40
84. 36 + 12 = 48 So what else is true?
85. Add board 5* + 46 = *8
86. Add board 35 + *3 = 7*
87. Number detectives: ? - 5 = 10
88. Number detectives: ? - 7 = 6
89. Number detectives: ? - 8 = 4
90. Write the missing number: 15 + 1 + ? = 20
91. Write the missing number: ? + 11 + 2 = 20
92. Write the missing number: 3 + 4 + ? = 20
93. Write the missing number: ? + 5 + 6 = 20
94. Write the missing number: 5 + 8 + ? = 20
95. Write the missing number: 4 + 8 + ? = 20
96. Write the missing number: 11 + ? + 2 = 20
97. Write the missing number: ? + 13 + 4 = 20
98. Write the missing number: 6 + 9 + ? = 20
99. Write the missing number: 4 + ? + 6 = 20
100. Subtraction chain 20 - 12 = ? - 6 = 2
101. Takeaway board: 17-?=11
102. Takeaway board: 15-?=11
103. Takeaway board: 18-? = 12
104. Takeaway board: 16-? = 13
105. Takeaway board: 19-? = 14
106. Put in the missing number: 5 + 4 + ? = 16
107. Put in the missing number: 11 + ? + 6 = 25
108. Write in the missing number: ? + 13 + 5 = 21
109. Put in the missing number: 9 + 2 + ? = 19
110. Put in the missing number: ? + 10 + 14 = 28
111. Subtraction Chain - 22-4=?-3=15
112. Subtraction Chain - ?-8=16-2=14
113. Subtraction Chain - 21-4 =?-1= 16
114. Subtraction Chain - ?-4=19-3=16
115. Mysteries of Fifty: 50-?=42, 50-?=45
116. Mysteries of Fifty: 50-?=48, 50-?=43
117. Mysteries of Fifty: 50-?=44, 50-?=47
118. Mysteries of Forty: 40-?=36, 40-?=31
119. Mysteries of Forty: 40-?=33, 40-?=39
120. Mysteries of Forty: 40-?=35, 40-?=38
121. Mysteries of Thirty: 30-?=29, 30-?=24
122. Mysteries of Thirty: 30-?=21, 30-?=27
123. Mysteries of Thirty: 30-?=26, 30-?=22
124. Spot the difference between 30 and 15.
125. Spot the difference between 12 and 25.
126. Spot the difference between 30 and 10.
127. Spot the difference between 40 and 10.
128. Spot the difference between 20 and 39.
129. Spot the difference between 18 and 25.
130. Spot the difference between 25 and 34.
131. Spot the difference between 19 and 31.
132. Spot the difference between 19 and 42.
133. Spot the difference between 36 and 15.
134. Same Difference - Difference between 10 and 40.
135. Write the missing number: 20 + 3 + ? = 30
136. Write the missing number: 12 + ? + 10 = 30
137. Write the missing number: 15 + ? + 5 = 30
138. Write the missing number: 9 + ? + 12 = 30
139. Write the missing number: ? + 5 + 4 = 30
140. Write the missing number: 15 + ? + 6 = 30
141. Write the missing number: 18 + ? + 2 = 30
142. Write the missing number: 20 + 3 + ? = 30
143. Write the missing number: ? + 13 + 5 = 30
144. Write the missing number: 14 + 7 + ? = 30
145. Number detectives: ? + 23 = 30
146. Number detectives: ? + 18 = 30
147. Number detectives: 30 - ? = 15
148. Number detectives: 30 - ? = 13
149. Subtract.chains 48 - 7 - 2 - 9, 35 - 4 - 3 - 8
150. Subtract.chains 47 - 4 - 3 - 7, 28 - 8 - 2 - 5
151. Subtract.chains 23 - 4 - 1 - 3, 36 - 5 - 2 - 6
152. Subtract.chains 28 - 5 - 2 - 10, 50 - 5 - 3 - 2
153. Spot the difference: 60 & 40, 12 & 18, 100 & 95
154. Spot the difference: 20 & 14, 17 & 9, 80 & 73
155. Spot the difference: 100 & 30, 19 & 11, 30 & 24
156. Spot the difference: 50 & 41, 100 & 92, 101 & 98
157. Subtraction chains 80-6-5-3, 70-4-2-5
158. Subtraction chains 30-9-2-5, 60-5-4-3
159. Subtraction chains 40-5-6-3, 50-9-2-8
160. Subtraction chains 90-3-5-3, 40-2-8-5
161. Subtraction chains 60-9-2-3, 50-3-6-10
162. Build A Total - number sequence, 24
163. Build A Total - number sequence, 11
164. Number Quest - find 1 number to complete 2 number sentences
165. Sign Scramble - complete 2 number sentences using given numbers
166. Build a Total - number sequence, 15
167. Number Quest - find 1 number to complete 2 number sentences
168. Number Quest - find 1 number to complete 2 number sentences
169. 16 go to WaterWorld: 5+4+3+?
170. 17 go to Waterworld: 6+5+2+?
171. 14 go to Waterworld: 6+3+2+?
172. 18 go to WaterWorld: 3+3+2+?
173. 15 go to WaterWorld: 5+3+2+?
174. 16 go to Waterworld? 2+3+3+?
175. 19 go to Waterworld: 5+4+3+?
176. Make 50: 32+8+? = 50