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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Friday November 13 2026
09:22:36 AM | Friday November 13 2026
09:22:36 AMFlip Answers |
| 1) | 404 * 396 = | | 1) 400 * 400 - 4 * 4 = 159984 |
| 2) | 396 * 404 = | | 2) 400 * 400 - 4 * 4 = 159984 |
| 3) | 403 * 397 = | | 3) 400 * 400 - 3 * 3 = 159991 |
| 4) | 93 * 107 = | | 4) 100 * 100 - 7 * 7 = 9951 |
| 5) | 101 * 99 = | | 5) 100 * 100 - 1 * 1 = 9999 |
| 6) | 396 * 404 = | | 6) 400 * 400 - 4 * 4 = 159984 |
| 7) | 207 * 193 = | | 7) 200 * 200 - 7 * 7 = 39951 |
| 8) | 194 * 206 = | | 8) 200 * 200 - 6 * 6 = 39964 |
| 9) | 409 * 391 = | | 9) 400 * 400 - 9 * 9 = 159919 |
| 10) | 94 * 106 = | | 10) 100 * 100 - 6 * 6 = 9964 |
| 11) | 263 * 55 - 55 * 63 = | | 11) ( 263 - 63) * 55 = 11000 |
| 12) | 139 * 73 - 39 * 73 = | | 12) ( 139 - 39) * 73 = 7300 |
| 13) | 38 * 95 + 95 * 162 = | | 13) ( 162 + 38) * 95 = 19000 |
| 14) | 45 * 146 + 54 * 45 = | | 14) ( 146 + 54) * 45 = 9000 |
| 15) | 73 * 253 - 73 * 53 = | | 15) ( 253 - 53) * 73 = 14600 |
| 16) | 171 * 75 - 75 * 71 = | | 16) ( 171 - 71) * 75 = 7500 |
| 17) | 70 * 127 + 73 * 70 = | | 17) ( 127 + 73) * 70 = 14000 |
| 18) | 78 * 166 - 66 * 78 = | | 18) ( 166 - 66) * 78 = 7800 |
| 19) | 83 * 56 + 83 * 44 = | | 19) ( 56 + 44) * 83 = 8300 |
| 20) | 256 * 92 - 92 * 56 = | | 20) ( 256 - 56) * 92 = 18400 |
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Score: ______________ | |
