Math Main Page => Exercises - Math III
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Goal: to practice how to make use of distributive property on special numbers, like (A + B) * (A - B) = A*A - B*B, A*C +B*C = (A + B ) *C, A*C - B*C = (A-B) * C
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Tuesday February 17 2026
11:03:44 AM | Tuesday February 17 2026
11:03:44 AMFlip Answers |
| 1) | 408 * 392 = | | 1) 400 * 400 - 8 * 8 = 159936 |
| 2) | 308 * 292 = | | 2) 300 * 300 - 8 * 8 = 89936 |
| 3) | 295 * 305 = | | 3) 300 * 300 - 5 * 5 = 89975 |
| 4) | 397 * 403 = | | 4) 400 * 400 - 3 * 3 = 159991 |
| 5) | 209 * 191 = | | 5) 200 * 200 - 9 * 9 = 39919 |
| 6) | 193 * 207 = | | 6) 200 * 200 - 7 * 7 = 39951 |
| 7) | 403 * 397 = | | 7) 400 * 400 - 3 * 3 = 159991 |
| 8) | 298 * 302 = | | 8) 300 * 300 - 2 * 2 = 89996 |
| 9) | 92 * 108 = | | 9) 100 * 100 - 8 * 8 = 9936 |
| 10) | 108 * 92 = | | 10) 100 * 100 - 8 * 8 = 9936 |
| 11) | 91 * 52 + 148 * 91 = | | 11) ( 148 + 52) * 91 = 18200 |
| 12) | 267 * 86 - 86 * 67 = | | 12) ( 267 - 67) * 86 = 17200 |
| 13) | 30 * 137 - 37 * 30 = | | 13) ( 137 - 37) * 30 = 3000 |
| 14) | 87 * 69 + 87 * 31 = | | 14) ( 31 + 69) * 87 = 8700 |
| 15) | 168 * 25 - 68 * 25 = | | 15) ( 168 - 68) * 25 = 2500 |
| 16) | 153 * 65 - 53 * 65 = | | 16) ( 153 - 53) * 65 = 6500 |
| 17) | 79 * 146 + 54 * 79 = | | 17) ( 146 + 54) * 79 = 15800 |
| 18) | 48 * 67 + 48 * 33 = | | 18) ( 33 + 67) * 48 = 4800 |
| 19) | 77 * 262 - 77 * 62 = | | 19) ( 262 - 62) * 77 = 15400 |
| 20) | 65 * 59 + 65 * 141 = | | 20) ( 141 + 59) * 65 = 13000 |
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Score: ______________ | |
