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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Saturday May 16 2026
06:34:37 AM | Saturday May 16 2026
06:34:37 AMFlip Answers |
| 1) | 298 * 302 = | | 1) 300 * 300 - 2 * 2 = 89996 |
| 2) | 202 * 198 = | | 2) 200 * 200 - 2 * 2 = 39996 |
| 3) | 402 * 398 = | | 3) 400 * 400 - 2 * 2 = 159996 |
| 4) | 194 * 206 = | | 4) 200 * 200 - 6 * 6 = 39964 |
| 5) | 209 * 191 = | | 5) 200 * 200 - 9 * 9 = 39919 |
| 6) | 304 * 296 = | | 6) 300 * 300 - 4 * 4 = 89984 |
| 7) | 292 * 308 = | | 7) 300 * 300 - 8 * 8 = 89936 |
| 8) | 410 * 390 = | | 8) 400 * 400 - 10 * 10 = 159900 |
| 9) | 102 * 98 = | | 9) 100 * 100 - 2 * 2 = 9996 |
| 10) | 408 * 392 = | | 10) 400 * 400 - 8 * 8 = 159936 |
| 11) | 42 * 172 - 72 * 42 = | | 11) ( 172 - 72) * 42 = 4200 |
| 12) | 60 * 162 - 62 * 60 = | | 12) ( 162 - 62) * 60 = 6000 |
| 13) | 52 * 237 - 52 * 37 = | | 13) ( 237 - 37) * 52 = 10400 |
| 14) | 60 * 60 + 60 * 40 = | | 14) ( 40 + 60) * 60 = 6000 |
| 15) | 93 * 143 + 57 * 93 = | | 15) ( 143 + 57) * 93 = 18600 |
| 16) | 144 * 47 + 47 * 56 = | | 16) ( 144 + 56) * 47 = 9400 |
| 17) | 71 * 43 + 57 * 71 = | | 17) ( 57 + 43) * 71 = 7100 |
| 18) | 80 * 263 - 80 * 63 = | | 18) ( 263 - 63) * 80 = 16000 |
| 19) | 94 * 173 - 73 * 94 = | | 19) ( 173 - 73) * 94 = 9400 |
| 20) | 55 * 60 + 55 * 40 = | | 20) ( 60 + 40) * 55 = 5500 |
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Score: ______________ | |
