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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Tuesday June 02 2026
03:21:49 PM | Tuesday June 02 2026
03:21:49 PMFlip Answers |
| 1) | 307 * 293 = | | 1) 300 * 300 - 7 * 7 = 89951 |
| 2) | 109 * 91 = | | 2) 100 * 100 - 9 * 9 = 9919 |
| 3) | 294 * 306 = | | 3) 300 * 300 - 6 * 6 = 89964 |
| 4) | 96 * 104 = | | 4) 100 * 100 - 4 * 4 = 9984 |
| 5) | 90 * 110 = | | 5) 100 * 100 - 10 * 10 = 9900 |
| 6) | 409 * 391 = | | 6) 400 * 400 - 9 * 9 = 159919 |
| 7) | 291 * 309 = | | 7) 300 * 300 - 9 * 9 = 89919 |
| 8) | 308 * 292 = | | 8) 300 * 300 - 8 * 8 = 89936 |
| 9) | 398 * 402 = | | 9) 400 * 400 - 2 * 2 = 159996 |
| 10) | 201 * 199 = | | 10) 200 * 200 - 1 * 1 = 39999 |
| 11) | 27 * 82 + 82 * 73 = | | 11) ( 27 + 73) * 82 = 8200 |
| 12) | 35 * 72 + 35 * 128 = | | 12) ( 128 + 72) * 35 = 7000 |
| 13) | 132 * 94 + 94 * 68 = | | 13) ( 132 + 68) * 94 = 18800 |
| 14) | 152 * 76 - 52 * 76 = | | 14) ( 152 - 52) * 76 = 7600 |
| 15) | 70 * 46 + 70 * 154 = | | 15) ( 154 + 46) * 70 = 14000 |
| 16) | 24 * 266 - 24 * 66 = | | 16) ( 266 - 66) * 24 = 4800 |
| 17) | 256 * 33 - 33 * 56 = | | 17) ( 256 - 56) * 33 = 6600 |
| 18) | 37 * 41 + 41 * 63 = | | 18) ( 37 + 63) * 41 = 4100 |
| 19) | 237 * 83 - 37 * 83 = | | 19) ( 237 - 37) * 83 = 16600 |
| 20) | 61 * 147 - 47 * 61 = | | 20) ( 147 - 47) * 61 = 6100 |
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Score: ______________ | |
