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 February 12 2026
06:57:34 PM | Thursday February 12 2026
06:57:34 PMFlip Answers |
| 1) | 99 * 101 = | | 1) 100 * 100 - 1 * 1 = 9999 |
| 2) | 99 * 101 = | | 2) 100 * 100 - 1 * 1 = 9999 |
| 3) | 303 * 297 = | | 3) 300 * 300 - 3 * 3 = 89991 |
| 4) | 404 * 396 = | | 4) 400 * 400 - 4 * 4 = 159984 |
| 5) | 210 * 190 = | | 5) 200 * 200 - 10 * 10 = 39900 |
| 6) | 102 * 98 = | | 6) 100 * 100 - 2 * 2 = 9996 |
| 7) | 294 * 306 = | | 7) 300 * 300 - 6 * 6 = 89964 |
| 8) | 209 * 191 = | | 8) 200 * 200 - 9 * 9 = 39919 |
| 9) | 207 * 193 = | | 9) 200 * 200 - 7 * 7 = 39951 |
| 10) | 101 * 99 = | | 10) 100 * 100 - 1 * 1 = 9999 |
| 11) | 32 * 60 + 32 * 40 = | | 11) ( 60 + 40) * 32 = 3200 |
| 12) | 89 * 71 + 29 * 89 = | | 12) ( 29 + 71) * 89 = 8900 |
| 13) | 64 * 274 - 74 * 64 = | | 13) ( 274 - 74) * 64 = 12800 |
| 14) | 150 * 57 - 50 * 57 = | | 14) ( 150 - 50) * 57 = 5700 |
| 15) | 96 * 142 - 96 * 42 = | | 15) ( 142 - 42) * 96 = 9600 |
| 16) | 136 * 42 - 36 * 42 = | | 16) ( 136 - 36) * 42 = 4200 |
| 17) | 55 * 67 + 55 * 133 = | | 17) ( 133 + 67) * 55 = 11000 |
| 18) | 26 * 153 - 53 * 26 = | | 18) ( 153 - 53) * 26 = 2600 |
| 19) | 238 * 72 - 38 * 72 = | | 19) ( 238 - 38) * 72 = 14400 |
| 20) | 84 * 261 - 84 * 61 = | | 20) ( 261 - 61) * 84 = 16800 |
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Score: ______________ | |
