ACMNA083
Use equivalent number sentences involving addition and subtraction to find unknown quantities
1. | Adding tens: ?+ 36 = 66 | |
2. | Adding tens: ?+ 73 = 83 | |
3. | Adding tens: ?+ 46 = 86 | |
4. | Adding tens: 120 + ? = 140; 120 + 50 = ? | |
5. | Adding tens: 24 + ? = 64, 24 + 50 = ? | |
6. | Adding tens: 145 + ? = 155, 145 + 30 = ? | |
7. | Adding tens: 57 + ? = 97, 57 + 20 = ? | |
8. | Adding tens: 138 + ? = 178, 178 + 20 = ? | |
9. | Use the pattern: 2+4, 12+4, 120 + 40 | |
10. | Use the pattern: 4+1, 14+1, 140+10 | |
11. | Use The Pattern: 4+3, 14+3, 140+30 | |
12. | Use The Pattern: 2+7, 12+7, 120+70 | |
13. | Use The Pattern: 5+4, 15+4, 150+40 | |
14. | Use The Pattern: 3+6, 13+6, 130+60 | |
15. | Use The Pattern: 5+3, 15+3, 150+30 | |
16. | Number detectives: 80+?, 90+?, 40+?=100 | |
17. | Number detectives: 10+?, 70+?, 50+?=100 | |
18. | Number detectives: 25+?, 35+?, 55+? =100 | |
19. | Number detectives: 5+?, 45+?, 15+?=100 | |
20. | 100 Zone: 93 + 10, 94 + 10, 96 + 10 | |
21. | 100 Zone: 90 + 10, 92 + 10, 97 + 10 | |
22. | 100 Zone: 95 + 10,10 + 95, 105 - 10 | |
23. | 100 Zone: 98 + 10,10 + 98, 108 - 10 | |
24. | 100 Zone: 99 + 10,109 - 10, 10 + 99 | |
25. | 100 Zone: 70 + 40 = ? 90 + ? = 110, ? + 80 = 110 | |
26. | 100 Zone: 60 + 80 = ? 90 + ? = 140, ? + 100 = 140 | |
27. | 100 Zone: 70 + 80 = ? 100 + ? = 150, ? + 70 = 150 | |
28. | 100 Zone: 90 + 70 = ? 80 + ? = 160, ? + 60 = 160 | |
29. | Number detectives 235+6 = * | |
30. | Number detectives 98+7=* | |
31. | Number detectives 485+*= 493 | |
32. | Number detectives 515+*= 523 | |
33. | Number Detectives: 100 Pairs ? + 79 = 100 | |
34. | Number Detectives: 100 Pairs ? + 51 = 100 | |
35. | Number Detectives: 100 Pairs 63 + 37 = ? | |
36. | Number Detectives: 100 Pairs 88 + ? = 100 | |
37. | Use the pattern: 6+3, 60+30, 600+300 | |
38. | Use the pattern: 2+4, 20+40, 200+400 | |
39. | Use the pattern: 2+6, 20+60, 200+600 | |
40. | Use the pattern: 4+9, 40+90, 400+900 | |
41. | Use the pattern: 1+7, 10+70, 100+700 | |
42. | Add Hundreds: 600+ * = 946 | |
43. | Add Hundreds: 200+ * = 580 | |
44. | Add Hundreds: 400+ * = 963 | |
45. | Add Hundreds: 100+ * = 319 | |
46. | Add Hundreds: 300+ * = 565 | |
47. | Adding Tens: 416 + 50 = * | |
48. | Adding Tens: 542 + 50 = * | |
49. | Add Hundreds: 500+246 | |
50. | Add Hundreds: 100+280 | |
51. | Add Hundreds: 300+453 | |
52. | Add Hundreds: 200+43 | |
53. | Add Hundreds: 800+163 | |
54. | Adding Tens: * + 726 = 786 | |
55. | Adding Tens: * + 314 = 394 | |
56. | Add Hundreds: * + 300 = 330 | |
57. | Add Hundreds: * + 200 = 241 | |
58. | Add Hundreds: * + 800 = 819 | |
59. | Add Hundreds: * + 300 = 345 | |
60. | Add Hundreds: * + 200 = 295 | |
61. | Number Detectives: 100 Pairs 85 + ?, 75 + ?, 45 +?= 100 | |
62. | Mystery number: ?+7=252 | |
63. | Mystery number: ?+6=174 | |
64. | Mystery number: ?+7=451 | |
65. | Mystery number: ?+6+163 | |
66. | Mystery number: 106+11=? | |
67. | Mystery number: 514+12=? | |
68. | Mystery number: 913+13=? | |
69. | Mystery number: 711+17=? | |
70. | Mystery number: 133+16=? | |
71. | Use the pattern: 5+2,50+20, 500+200=? | |
72. | Use the pattern: 5+4,50+40, 500+400=? | |
73. | Use the pattern: 7+1,70+10, 700+100=? | |
74. | Use the pattern: 2+3,20+30, 200+300=? | |
75. | Use the pattern: 3+8,30+80, 300+800=? | |
76. | Adding Tens: 235+50 =? | |
77. | Adding Tens: 338+50=? | |
78. | Adding Tens: 562+30=? | |
79. | Adding Tens: ?+30=492 | |
80. | Mysteries of 30!: 20+?, 15+?, 5+? | |
81. | Mysteries of 30!: 19+?, 10+?, 16+? | |
82. | Mysteries of 30!: 12+?, 13+?, 14+? | |
83. | Mysteries of 30!: 9+?, 5+?, 7+? | |
84. | Mysteries of 30!: 26+?, 28+?, 22+? | |
85. | Complem. add/subtract: 136+419=555 | |
86. | Complem. add/subtract: 216+84=300 | |
87. | Complem. add/subtract: 112+32=144 | |
88. | Complem. add/subtract: 125+14=139 | |
89. | Complem. add/subtract: 105+24=129 | |
90. | Complem. add/subtract: 210+14=224 | |
91. | Number detectives: 65+?, 55+?, 85+?=100 | |
92. | Taking Tens: 90 - ? = 70 | |
93. | Use the pattern: 9-8, 90-80, 900-800 | |
94. | Use the pattern: 5-3, 50-30, 500-300 | |
95. | Use the pattern: 8-2, 80-20, 800-200 | |
96. | Use the Pattern: 7-3, 37-3, 167-3=? | |
97. | Use the Pattern: 9-5, 29-5, 249-5=? | |
98. | Use the Pattern: 6-3, 36-3, 166-3=? | |
99. | Use the Pattern: 8-1, 18-1, 128-1=? | |
100. | Use the Pattern: 6-4, 46-4, 286-4=? | |
101. | Subtracting tens: 86 - ? = 56 | |
102. | Subtracting tens: 94 - ? = 24 | |
103. | The Mysteries of 40!: 40-?=32, 40-?=29, 40-?=37 | |
104. | The Mysteries of 40!: 40-?=29, 40-?=38, 40-?=39 | |
105. | The Mysteries of 40!: 40-?=30, 40-?=33, 40-?=36 | |
106. | The Mysteries of 30!: 30-?=26, 30-?=23, 30-?=27 | |
107. | The Mysteries of 30!: 30-?=23, 30-?=13, 30-?=3 | |
108. | The Mysteries of 30!: 30-?=18, 30-?=15, 30-?=12 | |
109. | The Mysteries of 30!: 30-?=14, 30-?=19, 30-?=9 | |
110. | Subtraction chains: 30-4-10-8, 30-5-10-7 | |
111. | Subtraction chains: 30-4-16-8, 30-5-3-11 | |
112. | Subtraction chains: 30-8-6-12, 30-6-3-5 | |
113. | Subtraction chains: 30-3-4-13, 30-6-5-7 | |
114. | Subtraction chains: 30-10-9-4, 30-5-9-7 | |
115. | The Mysteries of 40! 40-14,23,19 | |
116. | The Mysteries of 40! 40-8,12,25 | |
117. | The Mysteries of 40! 40-20,15,9 | |
118. | The Mysteries of 50! 50-35,12,6 | |
119. | The Mysteries of 50! 50-16,21,30 | |
120. | Subtraction chains: ?-12-7-6=65, ?-11-6-13=50 | |
121. | Subtraction chains: ?-11-10-12, ?-8-11-4=7 | |
122. | Subtraction chains: ?-10-11-9, 50-12-8-7=23 | |
123. | Subtraction chains: ?-11-8-10, ?-9-6-7=34 | |
124. | Subtraction chains: ?-7-9-12, ?-12-5-11 | |
125. | Take Tens: 67-?=47,430-70=? | |
126. | Take Tens: 71-?=21,250-30=? | |
127. | Take Tens: 66-?=36,360-80=? | |
128. | Take Tens: 94-?=54,740-20=? | |
129. | Take Tens: 89-?=19,460-50=? | |
130. | Take Tens: 86-?=26,170-40=? | |
131. | Take it away 352-18=334 | |
132. | Take it away 472-46=426 | |
133. | Hundreds Takeaway: 6*2-32* = *21 | |
134. | Hundreds Takeaway: **2-43*=362 | |
135. | Hundreds Takeaway: *1*-5*4=414 | |
136. | Hundreds Takeaway: *8*-2*2=132 | |
137. | What Was I Thinking? - find original number after operations | |
138. | What Was I Thinking? - find original number after operations | |
139. | What Was I Thinking? - find original number after operations | |
140. | All Things Equal - equivalent to 7 + 7 | |
141. | Which Operation? - 60*4 = 56 | |
142. | Number Quest - complete number sentence | |
143. | Number Quest - complete number sentence | |
144. | Crossing 100: Add 70 to 60 | |
145. | Crossing 100: Add 60 to 80 | |
146. | Crossing 100: Add 90 to 40 | |
147. | Crossing 100: Add 50 to 90 | |
148. | Crossing 100: Add 50 to 70 | |
149. | Build A Total - number sequence, 25 | |
150. | Build A Total - number sequence, 35 |