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 November 07 2026
12:35:35 PM | Saturday November 07 2026
12:35:35 PMFlip Answers |
| 1) | 296 * 304 = | | 1) 300 * 300 - 4 * 4 = 89984 |
| 2) | 395 * 405 = | | 2) 400 * 400 - 5 * 5 = 159975 |
| 3) | 401 * 399 = | | 3) 400 * 400 - 1 * 1 = 159999 |
| 4) | 292 * 308 = | | 4) 300 * 300 - 8 * 8 = 89936 |
| 5) | 109 * 91 = | | 5) 100 * 100 - 9 * 9 = 9919 |
| 6) | 90 * 110 = | | 6) 100 * 100 - 10 * 10 = 9900 |
| 7) | 190 * 210 = | | 7) 200 * 200 - 10 * 10 = 39900 |
| 8) | 291 * 309 = | | 8) 300 * 300 - 9 * 9 = 89919 |
| 9) | 201 * 199 = | | 9) 200 * 200 - 1 * 1 = 39999 |
| 10) | 398 * 402 = | | 10) 400 * 400 - 2 * 2 = 159996 |
| 11) | 45 * 63 + 137 * 45 = | | 11) ( 137 + 63) * 45 = 9000 |
| 12) | 84 * 272 - 72 * 84 = | | 12) ( 272 - 72) * 84 = 16800 |
| 13) | 126 * 24 + 24 * 74 = | | 13) ( 126 + 74) * 24 = 4800 |
| 14) | 169 * 64 - 64 * 69 = | | 14) ( 169 - 69) * 64 = 6400 |
| 15) | 79 * 152 - 52 * 79 = | | 15) ( 152 - 52) * 79 = 7900 |
| 16) | 37 * 142 + 37 * 58 = | | 16) ( 142 + 58) * 37 = 7400 |
| 17) | 64 * 172 - 72 * 64 = | | 17) ( 172 - 72) * 64 = 6400 |
| 18) | 23 * 273 - 23 * 73 = | | 18) ( 273 - 73) * 23 = 4600 |
| 19) | 150 * 76 - 50 * 76 = | | 19) ( 150 - 50) * 76 = 7600 |
| 20) | 68 * 51 + 51 * 32 = | | 20) ( 32 + 68) * 51 = 5100 |
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Score: ______________ | |
