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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Sunday February 15 2026
07:52:43 PM | Sunday February 15 2026
07:52:43 PMFlip Answers |
| 1) | 108 * 92 = | | 1) 100 * 100 - 8 * 8 = 9936 |
| 2) | 298 * 302 = | | 2) 300 * 300 - 2 * 2 = 89996 |
| 3) | 99 * 101 = | | 3) 100 * 100 - 1 * 1 = 9999 |
| 4) | 308 * 292 = | | 4) 300 * 300 - 8 * 8 = 89936 |
| 5) | 299 * 301 = | | 5) 300 * 300 - 1 * 1 = 89999 |
| 6) | 303 * 297 = | | 6) 300 * 300 - 3 * 3 = 89991 |
| 7) | 296 * 304 = | | 7) 300 * 300 - 4 * 4 = 89984 |
| 8) | 95 * 105 = | | 8) 100 * 100 - 5 * 5 = 9975 |
| 9) | 401 * 399 = | | 9) 400 * 400 - 1 * 1 = 159999 |
| 10) | 198 * 202 = | | 10) 200 * 200 - 2 * 2 = 39996 |
| 11) | 27 * 254 - 54 * 27 = | | 11) ( 254 - 54) * 27 = 5400 |
| 12) | 170 * 67 - 70 * 67 = | | 12) ( 170 - 70) * 67 = 6700 |
| 13) | 61 * 270 - 70 * 61 = | | 13) ( 270 - 70) * 61 = 12200 |
| 14) | 97 * 163 - 97 * 63 = | | 14) ( 163 - 63) * 97 = 9700 |
| 15) | 90 * 248 - 48 * 90 = | | 15) ( 248 - 48) * 90 = 18000 |
| 16) | 125 * 82 + 75 * 82 = | | 16) ( 125 + 75) * 82 = 16400 |
| 17) | 71 * 56 + 129 * 56 = | | 17) ( 129 + 71) * 56 = 11200 |
| 18) | 147 * 27 - 47 * 27 = | | 18) ( 147 - 47) * 27 = 2700 |
| 19) | 51 * 55 + 55 * 49 = | | 19) ( 49 + 51) * 55 = 5500 |
| 20) | 96 * 161 + 39 * 96 = | | 20) ( 161 + 39) * 96 = 19200 |
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Score: ______________ | |
