Exercise 1
What to do
Use the information given to you to derive the answer to a similar problem.
- If 9 × 20 = 180 what is 9 × 21 ? 189
- If 8 × 30 = 240 what is 8 × 31 ? 248
- If 4 × 40 = 160 what is 4 × 42 ?168
- If 5 × 50 = 250 what is 5 × 51 ? 255
- If 3 × 60 = 180 what is 3 x 62 ? 186
- If 2 × 70 = 140 what is 2 × 73 ? 161
- If 4 × 80 = 320 what is 4 × 82 ? 328
8) If 2 × 90 = 180 what is 2 × 94 ? 180
Exercise 2
What to do
Use the information given to you to derive the answer to a similar problem.
1) If 9 × 20 = 180 what is 9 × 19 ? 171
2) If 8 × 30 = 240 what is 8 × 29 ? 232
3) If 7 × 40 = 280 what is 7 × 39 ? 273
4) If 5 × 50 = 250 what is 5 × 49 ? 245
5) If 3 × 60 = 180 what is 3 × 58 ? 174
6) If 2 × 70 = 140 what is 2 × 67 ? 134
7) If 4 × 80 = 320 what is 4 × 78 ? 312
8) If 2 × 90 = 180 what is 2 × 86 ? 172
Exercise 3
What to do
Use the information given to you to derive the answer to a similar problem.
- If 9 × 20 = 180 what is 9 × 22 ? 198
- If 7 × 30 = 210 what is 7 × 32 ? 224
- If 5 × 40 = 200 what is 5 × 43 ? 215
- If 4 × 50 = 200 what is 4 × 51 ? 204
- If 3 × 60 = 180 what is 3 × 61 ? 183
- If 6 × 70 = 420 what is 6 × 73 ? 426
- If 6 × 80 = 480 what is 6 × 81 ? 486
8) If 8 × 90 = 720 what is 8 × 92 ? 736
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