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 08 2026
07:15:06 PM | Sunday February 08 2026
07:15:06 PMFlip Answers |
| 1) | 304 * 296 = | | 1) 300 * 300 - 4 * 4 = 89984 |
| 2) | 308 * 292 = | | 2) 300 * 300 - 8 * 8 = 89936 |
| 3) | 406 * 394 = | | 3) 400 * 400 - 6 * 6 = 159964 |
| 4) | 98 * 102 = | | 4) 100 * 100 - 2 * 2 = 9996 |
| 5) | 195 * 205 = | | 5) 200 * 200 - 5 * 5 = 39975 |
| 6) | 191 * 209 = | | 6) 200 * 200 - 9 * 9 = 39919 |
| 7) | 405 * 395 = | | 7) 400 * 400 - 5 * 5 = 159975 |
| 8) | 402 * 398 = | | 8) 400 * 400 - 2 * 2 = 159996 |
| 9) | 308 * 292 = | | 9) 300 * 300 - 8 * 8 = 89936 |
| 10) | 301 * 299 = | | 10) 300 * 300 - 1 * 1 = 89999 |
| 11) | 68 * 39 + 39 * 32 = | | 11) ( 32 + 68) * 39 = 3900 |
| 12) | 242 * 65 - 42 * 65 = | | 12) ( 242 - 42) * 65 = 13000 |
| 13) | 274 * 22 - 22 * 74 = | | 13) ( 274 - 74) * 22 = 4400 |
| 14) | 63 * 82 + 137 * 82 = | | 14) ( 137 + 63) * 82 = 16400 |
| 15) | 252 * 94 - 94 * 52 = | | 15) ( 252 - 52) * 94 = 18800 |
| 16) | 68 * 28 + 28 * 132 = | | 16) ( 132 + 68) * 28 = 5600 |
| 17) | 170 * 70 - 70 * 70 = | | 17) ( 170 - 70) * 70 = 7000 |
| 18) | 28 * 156 - 28 * 56 = | | 18) ( 156 - 56) * 28 = 2800 |
| 19) | 160 * 71 - 60 * 71 = | | 19) ( 160 - 60) * 71 = 7100 |
| 20) | 244 * 96 - 44 * 96 = | | 20) ( 244 - 44) * 96 = 19200 |
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Score: ______________ | |
