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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Thursday August 13 2026
02:35:33 PM | Thursday August 13 2026
02:35:33 PMFlip Answers |
| 1) | 195 * 205 = | | 1) 200 * 200 - 5 * 5 = 39975 |
| 2) | 195 * 205 = | | 2) 200 * 200 - 5 * 5 = 39975 |
| 3) | 297 * 303 = | | 3) 300 * 300 - 3 * 3 = 89991 |
| 4) | 108 * 92 = | | 4) 100 * 100 - 8 * 8 = 9936 |
| 5) | 101 * 99 = | | 5) 100 * 100 - 1 * 1 = 9999 |
| 6) | 199 * 201 = | | 6) 200 * 200 - 1 * 1 = 39999 |
| 7) | 193 * 207 = | | 7) 200 * 200 - 7 * 7 = 39951 |
| 8) | 95 * 105 = | | 8) 100 * 100 - 5 * 5 = 9975 |
| 9) | 95 * 105 = | | 9) 100 * 100 - 5 * 5 = 9975 |
| 10) | 297 * 303 = | | 10) 300 * 300 - 3 * 3 = 89991 |
| 11) | 71 * 80 + 80 * 29 = | | 11) ( 29 + 71) * 80 = 8000 |
| 12) | 57 * 159 - 59 * 57 = | | 12) ( 159 - 59) * 57 = 5700 |
| 13) | 155 * 34 - 55 * 34 = | | 13) ( 155 - 55) * 34 = 3400 |
| 14) | 29 * 41 + 59 * 29 = | | 14) ( 59 + 41) * 29 = 2900 |
| 15) | 81 * 39 + 81 * 61 = | | 15) ( 61 + 39) * 81 = 8100 |
| 16) | 242 * 22 - 22 * 42 = | | 16) ( 242 - 42) * 22 = 4400 |
| 17) | 64 * 82 + 36 * 82 = | | 17) ( 36 + 64) * 82 = 8200 |
| 18) | 259 * 88 - 59 * 88 = | | 18) ( 259 - 59) * 88 = 17600 |
| 19) | 47 * 71 + 47 * 29 = | | 19) ( 29 + 71) * 47 = 4700 |
| 20) | 64 * 63 + 137 * 64 = | | 20) ( 137 + 63) * 64 = 12800 |
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Score: ______________ | |
