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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Monday June 22 2026
09:06:03 AM | Monday June 22 2026
09:06:03 AMFlip Answers |
| 1) | 407 * 393 = | | 1) 400 * 400 - 7 * 7 = 159951 |
| 2) | 97 * 103 = | | 2) 100 * 100 - 3 * 3 = 9991 |
| 3) | 201 * 199 = | | 3) 200 * 200 - 1 * 1 = 39999 |
| 4) | 192 * 208 = | | 4) 200 * 200 - 8 * 8 = 39936 |
| 5) | 209 * 191 = | | 5) 200 * 200 - 9 * 9 = 39919 |
| 6) | 294 * 306 = | | 6) 300 * 300 - 6 * 6 = 89964 |
| 7) | 193 * 207 = | | 7) 200 * 200 - 7 * 7 = 39951 |
| 8) | 97 * 103 = | | 8) 100 * 100 - 3 * 3 = 9991 |
| 9) | 295 * 305 = | | 9) 300 * 300 - 5 * 5 = 89975 |
| 10) | 295 * 305 = | | 10) 300 * 300 - 5 * 5 = 89975 |
| 11) | 75 * 51 + 75 * 49 = | | 11) ( 51 + 49) * 75 = 7500 |
| 12) | 70 * 59 + 30 * 59 = | | 12) ( 30 + 70) * 59 = 5900 |
| 13) | 62 * 72 + 128 * 62 = | | 13) ( 128 + 72) * 62 = 12400 |
| 14) | 66 * 164 + 66 * 36 = | | 14) ( 164 + 36) * 66 = 13200 |
| 15) | 38 * 64 + 38 * 36 = | | 15) ( 64 + 36) * 38 = 3800 |
| 16) | 136 * 46 - 46 * 36 = | | 16) ( 136 - 36) * 46 = 4600 |
| 17) | 75 * 153 + 47 * 75 = | | 17) ( 153 + 47) * 75 = 15000 |
| 18) | 87 * 164 - 64 * 87 = | | 18) ( 164 - 64) * 87 = 8700 |
| 19) | 268 * 56 - 68 * 56 = | | 19) ( 268 - 68) * 56 = 11200 |
| 20) | 47 * 35 + 35 * 153 = | | 20) ( 153 + 47) * 35 = 7000 |
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Score: ______________ | |
