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 August 10 2026
01:12:45 PM | Monday August 10 2026
01:12:45 PMFlip Answers |
| 1) | 204 * 196 = | | 1) 200 * 200 - 4 * 4 = 39984 |
| 2) | 209 * 191 = | | 2) 200 * 200 - 9 * 9 = 39919 |
| 3) | 409 * 391 = | | 3) 400 * 400 - 9 * 9 = 159919 |
| 4) | 299 * 301 = | | 4) 300 * 300 - 1 * 1 = 89999 |
| 5) | 308 * 292 = | | 5) 300 * 300 - 8 * 8 = 89936 |
| 6) | 291 * 309 = | | 6) 300 * 300 - 9 * 9 = 89919 |
| 7) | 92 * 108 = | | 7) 100 * 100 - 8 * 8 = 9936 |
| 8) | 394 * 406 = | | 8) 400 * 400 - 6 * 6 = 159964 |
| 9) | 93 * 107 = | | 9) 100 * 100 - 7 * 7 = 9951 |
| 10) | 191 * 209 = | | 10) 200 * 200 - 9 * 9 = 39919 |
| 11) | 41 * 53 + 41 * 147 = | | 11) ( 147 + 53) * 41 = 8200 |
| 12) | 254 * 29 - 29 * 54 = | | 12) ( 254 - 54) * 29 = 5800 |
| 13) | 56 * 163 - 56 * 63 = | | 13) ( 163 - 63) * 56 = 5600 |
| 14) | 146 * 50 - 46 * 50 = | | 14) ( 146 - 46) * 50 = 5000 |
| 15) | 162 * 56 + 38 * 56 = | | 15) ( 162 + 38) * 56 = 11200 |
| 16) | 42 * 250 - 50 * 42 = | | 16) ( 250 - 50) * 42 = 8400 |
| 17) | 49 * 44 + 51 * 44 = | | 17) ( 51 + 49) * 44 = 4400 |
| 18) | 95 * 37 + 163 * 95 = | | 18) ( 163 + 37) * 95 = 19000 |
| 19) | 34 * 157 + 43 * 34 = | | 19) ( 157 + 43) * 34 = 6800 |
| 20) | 252 * 39 - 52 * 39 = | | 20) ( 252 - 52) * 39 = 7800 |
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Score: ______________ | |
