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 February 27 2026
05:05:37 PM | Friday February 27 2026
05:05:37 PMFlip Answers |
| 1) | 196 * 204 = | | 1) 200 * 200 - 4 * 4 = 39984 |
| 2) | 91 * 109 = | | 2) 100 * 100 - 9 * 9 = 9919 |
| 3) | 209 * 191 = | | 3) 200 * 200 - 9 * 9 = 39919 |
| 4) | 397 * 403 = | | 4) 400 * 400 - 3 * 3 = 159991 |
| 5) | 193 * 207 = | | 5) 200 * 200 - 7 * 7 = 39951 |
| 6) | 308 * 292 = | | 6) 300 * 300 - 8 * 8 = 89936 |
| 7) | 304 * 296 = | | 7) 300 * 300 - 4 * 4 = 89984 |
| 8) | 195 * 205 = | | 8) 200 * 200 - 5 * 5 = 39975 |
| 9) | 391 * 409 = | | 9) 400 * 400 - 9 * 9 = 159919 |
| 10) | 293 * 307 = | | 10) 300 * 300 - 7 * 7 = 89951 |
| 11) | 243 * 29 - 29 * 43 = | | 11) ( 243 - 43) * 29 = 5800 |
| 12) | 55 * 38 + 62 * 55 = | | 12) ( 38 + 62) * 55 = 5500 |
| 13) | 58 * 128 + 58 * 72 = | | 13) ( 128 + 72) * 58 = 11600 |
| 14) | 67 * 56 + 133 * 56 = | | 14) ( 133 + 67) * 56 = 11200 |
| 15) | 44 * 25 + 25 * 156 = | | 15) ( 156 + 44) * 25 = 5000 |
| 16) | 25 * 140 - 40 * 25 = | | 16) ( 140 - 40) * 25 = 2500 |
| 17) | 68 * 275 - 68 * 75 = | | 17) ( 275 - 75) * 68 = 13600 |
| 18) | 163 * 33 - 63 * 33 = | | 18) ( 163 - 63) * 33 = 3300 |
| 19) | 57 * 59 + 41 * 57 = | | 19) ( 59 + 41) * 57 = 5700 |
| 20) | 49 * 155 - 55 * 49 = | | 20) ( 155 - 55) * 49 = 4900 |
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Score: ______________ | |
