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 23 2026
08:23:59 PM | Saturday May 23 2026
08:23:59 PMFlip Answers |
| 1) | 403 * 397 = | | 1) 400 * 400 - 3 * 3 = 159991 |
| 2) | 403 * 397 = | | 2) 400 * 400 - 3 * 3 = 159991 |
| 3) | 99 * 101 = | | 3) 100 * 100 - 1 * 1 = 9999 |
| 4) | 196 * 204 = | | 4) 200 * 200 - 4 * 4 = 39984 |
| 5) | 299 * 301 = | | 5) 300 * 300 - 1 * 1 = 89999 |
| 6) | 93 * 107 = | | 6) 100 * 100 - 7 * 7 = 9951 |
| 7) | 98 * 102 = | | 7) 100 * 100 - 2 * 2 = 9996 |
| 8) | 194 * 206 = | | 8) 200 * 200 - 6 * 6 = 39964 |
| 9) | 293 * 307 = | | 9) 300 * 300 - 7 * 7 = 89951 |
| 10) | 108 * 92 = | | 10) 100 * 100 - 8 * 8 = 9936 |
| 11) | 266 * 83 - 83 * 66 = | | 11) ( 266 - 66) * 83 = 16600 |
| 12) | 46 * 89 + 54 * 89 = | | 12) ( 46 + 54) * 89 = 8900 |
| 13) | 91 * 154 + 46 * 91 = | | 13) ( 154 + 46) * 91 = 18200 |
| 14) | 84 * 45 + 84 * 55 = | | 14) ( 45 + 55) * 84 = 8400 |
| 15) | 39 * 65 + 35 * 39 = | | 15) ( 65 + 35) * 39 = 3900 |
| 16) | 53 * 49 + 53 * 51 = | | 16) ( 49 + 51) * 53 = 5300 |
| 17) | 155 * 60 - 55 * 60 = | | 17) ( 155 - 55) * 60 = 6000 |
| 18) | 82 * 244 - 44 * 82 = | | 18) ( 244 - 44) * 82 = 16400 |
| 19) | 69 * 152 + 69 * 48 = | | 19) ( 152 + 48) * 69 = 13800 |
| 20) | 24 * 48 + 24 * 52 = | | 20) ( 52 + 48) * 24 = 2400 |
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Score: ______________ | |
