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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Wednesday July 08 2026
02:56:19 AM | Wednesday July 08 2026
02:56:19 AMFlip Answers |
| 1) | 398 * 402 = | | 1) 400 * 400 - 2 * 2 = 159996 |
| 2) | 101 * 99 = | | 2) 100 * 100 - 1 * 1 = 9999 |
| 3) | 98 * 102 = | | 3) 100 * 100 - 2 * 2 = 9996 |
| 4) | 305 * 295 = | | 4) 300 * 300 - 5 * 5 = 89975 |
| 5) | 195 * 205 = | | 5) 200 * 200 - 5 * 5 = 39975 |
| 6) | 201 * 199 = | | 6) 200 * 200 - 1 * 1 = 39999 |
| 7) | 306 * 294 = | | 7) 300 * 300 - 6 * 6 = 89964 |
| 8) | 92 * 108 = | | 8) 100 * 100 - 8 * 8 = 9936 |
| 9) | 199 * 201 = | | 9) 200 * 200 - 1 * 1 = 39999 |
| 10) | 194 * 206 = | | 10) 200 * 200 - 6 * 6 = 39964 |
| 11) | 158 * 70 + 42 * 70 = | | 11) ( 158 + 42) * 70 = 14000 |
| 12) | 48 * 44 + 44 * 52 = | | 12) ( 48 + 52) * 44 = 4400 |
| 13) | 130 * 82 + 82 * 70 = | | 13) ( 130 + 70) * 82 = 16400 |
| 14) | 67 * 252 - 52 * 67 = | | 14) ( 252 - 52) * 67 = 13400 |
| 15) | 87 * 52 + 148 * 87 = | | 15) ( 148 + 52) * 87 = 17400 |
| 16) | 61 * 69 + 39 * 69 = | | 16) ( 61 + 39) * 69 = 6900 |
| 17) | 163 * 81 - 63 * 81 = | | 17) ( 163 - 63) * 81 = 8100 |
| 18) | 95 * 274 - 74 * 95 = | | 18) ( 274 - 74) * 95 = 19000 |
| 19) | 62 * 66 + 38 * 66 = | | 19) ( 62 + 38) * 66 = 6600 |
| 20) | 84 * 174 - 74 * 84 = | | 20) ( 174 - 74) * 84 = 8400 |
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Score: ______________ | |
