1. NSW Syllabus
  2. Maths
  3. Stage 2
  4. Numbers and Algebra
  5. Addition and Subtraction
  6. MA2-5NA
  7. Addition and Subtraction 1
  8. Recognise and explain the connection between addition and subtraction (ACMNA054)

Explain and check solutions to problems, including by using the inverse operation

1. Make 20: 7+4+?
2. Make 20: 11+5+?
3. Make 20: 8+9+?
4. Add Board: *0 + 20 = 100
5. Make 50: 20+10+?
6. Make 50: 20+10+?
7. Make 50: 20+10+?
8. Make 50: 20+10+?
9. Make 50: 20+10+?
10. Make 30: 10 + 11 + ? = 30
11. Make 50: 20+10+?
12. Make 30: 19 + 2 + ? = 30
13. Make 30: 20 + 10 + ? = 30
14. Make 30: 16 + 4 + ? = 30
15. Make 30: 18 + 3 + ? = 30
16. Make 50: 40 + 4 + ?
17. Make 36: 20 + 14 + ?
18. Make 39: 30 + 6 + ?
19. Make 37: 12 + 20 + 5
20. Make 34: 10 + 22 + ?
21. Make 50: 39+7+? = 50
22. Make 50: 39+5+? = 50
23. Make 50: 35+5+? = 50
24. Make 50: 38+10+? = 50
25. Make 50: 42+6+? = 50
26. Number detectives 45+*=100
27. Number detectives 75+*=100
28. Number detectives 85+*=100
29. Number detectives 35+*=100
30. Number detectives 5+*=100
31. Add board 5* + 46 = *8
32. Add board 35 + *3 = 7*
33. Make 200: 130+50+*
34. Make 200: 70+100+*
35. Make 200: 60+40+*
36. Make 200: 90+30+*
37. Make 200: 150+40+*
38. On the Board 45 + 3* = *7
39. On the Board 3* + *5 = 98
40. On the Board 4* + 42 = *9
41. On the Board 3* + 62 = *6
42. On the Board 8* + *6 = 98
43. On the Board 33 + *5 = 7*
44. On the Board *8 + 51 = 7*
45. On the Board: *52+10*=3*8
46. On the Board: *8*+91=*78
47. On the Board: *46+*2=43*
48. On the Board: *6*+73=5*6
49. Make 100: 50, 20 & ?
50. Make 100: 60, 20 & ?
51. Make 100: 10, 40 & ?
52. Make 100: 10, 30 & ?
53. Make 100: 60, 40 & ?
54. On the Board: *4+7*=100
55. On the Board: *4+3*=100
56. Hundreds and hundreds: 42?+3?8=79?
57. Hundreds and hundreds: 17?+?23=2?7
58. Ball skills: How many more to make 10? 7+2+?
59. Ball skills: How many more to make 10? 6+3+?
60. Ball skills: How many more to make 10? 5+3+?
61. Ball skills: How many more to make 10? 7+1+?
62. Ball skills: How many more to make 10? 2+3+?
63. Write the missing number: 15 + 1 + ? = 20
64. Write the missing number: ? + 11 + 2 = 20
65. Write the missing number: 3 + 4 + ? = 20
66. Write the missing number: ? + 5 + 6 = 20
67. Write the missing number: 5 + 8 + ? = 20
68. Write the missing number: 4 + 8 + ? = 20
69. Write the missing number: 11 + ? + 2 = 20
70. Write the missing number: ? + 13 + 4 = 20
71. Write the missing number: 6 + 9 + ? = 20
72. Write the missing number: 4 + ? + 6 = 20
73. Write the missing number: 8 + ? + 7 = 20
74. Write the missing number: 6 + ? + 8 = 20
75. Write the missing number: ? + 9 + 6 = 20
76. Write the missing number: 2 + 11 = ? = 20
77. Write the missing number: ? + 7 + 9 = 20
78. Takeaway board: 17-?=11
79. Takeaway board: 15-?=11
80. Takeaway board: 18-? = 12
81. Takeaway board: 16-? = 13
82. Takeaway board: 19-? = 14
83. Put in the missing number: 5 + 4 + ? = 16
84. Put in the missing number: 11 + ? + 6 = 25
85. Write in the missing number: ? + 13 + 5 = 21
86. Put in the missing number: 9 + 2 + ? = 19
87. Put in the missing number: ? + 10 + 14 = 28
88. Write the missing number: 20 + 3 + ? = 30
89. Write the missing number: 12 + ? + 10 = 30
90. Write the missing number: 15 + ? + 5 = 30
91. Write the missing number: 9 + ? + 12 = 30
92. Write the missing number: ? + 5 + 4 = 30
93. Write the missing number: 15 + ? + 6 = 30
94. Write the missing number: 18 + ? + 2 = 30
95. Write the missing number: 20 + 3 + ? = 30
96. Write the missing number: ? + 13 + 5 = 30
97. Write the missing number: 14 + 7 + ? = 30
98. Takeaway board: 3? - 14 = 23
99. Takeaway board: 2? - 13 = 13
100. Takeaway board: 4? - 22 = 27
101. Takeaway board: 6? - 12 = 55
102. Takeaway board: 5? - 26 = 32
103. Write the missing number: 7 + ? + 14 = 30
104. Write the missing number: 15 + 4 + ? = 30
105. Write the missing number: 12 + 10 + ? = 30
106. Write the missing number: 15 + 5 + ? = 30
107. Write the missing number: 18 + 8 + ? = 30
108. Write the missing number: 5 + 5 + ? = 30
109. Takeaway board 152-? = 144
110. Takeaway board 547-? = 538
111. Takeaway board 553-? = 546
112. Takeaway board 291-? 285
113. Takeaway board 742-? = 737
114. Takeaway Board ?9-18 = 71
115. Takeaway Board 67-1?=53
116. Takeaway Board 79-?8=61
117. Takeaway Board ?7-17=50
118. Takeaway Board ?3-21=72
119. Write the missing number: 25 + 3 + ? = 35
120. Write the missing number: 25 + 4 + ? = 35
121. Write the missing number: 25 + 2 + ? = 35
122. Write the missing number: 25 + 5 + ? = 35
123. Write the missing number: 25 + 1 + ? = 35
124. Write the missing number: 35 + 5 + ? = 50
125. Write the missing number: 35 + 7 + ? = 50
126. Write the missing number: 35 + 9 + ? = 50
127. Write the missing number: 35 + 13 + ? = 50
128. Write the missing number: 35 + 11 + ? = 50
129. Hundreds takeaway 350-**=330
130. Hundreds takeaway 697-**=614
131. Hundreds takeaway 457-**=425
132. Hundreds takeaway 596-**=543
133. Hundreds takeaway 875-**=865
134. Hundreds takeaway 997-**=971
135. Hundreds Takeaway: 6*2-32* = *21
136. Hundreds Takeaway: **2-43*=362
137. Hundreds Takeaway: *1*-5*4=414
138. Hundreds Takeaway: *8*-2*2=132
139. Hundreds Takeaway: 5*9-35*=*11
140. Sum In A Circle - numbers in each groups total 15
141. Sum In A Circle - numbers in each group total 15
142. 16 go to WaterWorld: 5+4+3+?
143. 17 go to Waterworld: 6+5+2+?
144. 14 go to Waterworld: 6+3+2+?
145. 18 go to WaterWorld: 3+3+2+?
146. 15 go to WaterWorld: 5+3+2+?
147. 16 go to Waterworld? 2+3+3+?
148. 19 go to Waterworld: 5+4+3+?
149. Make 50: 32+8+? = 50
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