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 April 18 2026
04:53:04 PM | Saturday April 18 2026
04:53:04 PMFlip Answers |
| 1) | 304 * 296 = | | 1) 300 * 300 - 4 * 4 = 89984 |
| 2) | 403 * 397 = | | 2) 400 * 400 - 3 * 3 = 159991 |
| 3) | 290 * 310 = | | 3) 300 * 300 - 10 * 10 = 89900 |
| 4) | 201 * 199 = | | 4) 200 * 200 - 1 * 1 = 39999 |
| 5) | 404 * 396 = | | 5) 400 * 400 - 4 * 4 = 159984 |
| 6) | 96 * 104 = | | 6) 100 * 100 - 4 * 4 = 9984 |
| 7) | 294 * 306 = | | 7) 300 * 300 - 6 * 6 = 89964 |
| 8) | 192 * 208 = | | 8) 200 * 200 - 8 * 8 = 39936 |
| 9) | 407 * 393 = | | 9) 400 * 400 - 7 * 7 = 159951 |
| 10) | 398 * 402 = | | 10) 400 * 400 - 2 * 2 = 159996 |
| 11) | 36 * 48 + 64 * 48 = | | 11) ( 36 + 64) * 48 = 4800 |
| 12) | 81 * 32 + 68 * 81 = | | 12) ( 32 + 68) * 81 = 8100 |
| 13) | 248 * 21 - 48 * 21 = | | 13) ( 248 - 48) * 21 = 4200 |
| 14) | 21 * 40 + 21 * 60 = | | 14) ( 40 + 60) * 21 = 2100 |
| 15) | 31 * 165 - 31 * 65 = | | 15) ( 165 - 65) * 31 = 3100 |
| 16) | 165 * 57 - 57 * 65 = | | 16) ( 165 - 65) * 57 = 5700 |
| 17) | 46 * 44 + 54 * 44 = | | 17) ( 54 + 46) * 44 = 4400 |
| 18) | 51 * 260 - 60 * 51 = | | 18) ( 260 - 60) * 51 = 10200 |
| 19) | 65 * 168 - 65 * 68 = | | 19) ( 168 - 68) * 65 = 6500 |
| 20) | 147 * 49 - 49 * 47 = | | 20) ( 147 - 47) * 49 = 4900 |
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Score: ______________ | |
