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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Thursday January 22 2026
09:48:49 PM | Thursday January 22 2026
09:48:49 PMFlip Answers |
| 1) | 199 * 201 = | | 1) 200 * 200 - 1 * 1 = 39999 |
| 2) | 208 * 192 = | | 2) 200 * 200 - 8 * 8 = 39936 |
| 3) | 92 * 108 = | | 3) 100 * 100 - 8 * 8 = 9936 |
| 4) | 102 * 98 = | | 4) 100 * 100 - 2 * 2 = 9996 |
| 5) | 94 * 106 = | | 5) 100 * 100 - 6 * 6 = 9964 |
| 6) | 406 * 394 = | | 6) 400 * 400 - 6 * 6 = 159964 |
| 7) | 296 * 304 = | | 7) 300 * 300 - 4 * 4 = 89984 |
| 8) | 292 * 308 = | | 8) 300 * 300 - 8 * 8 = 89936 |
| 9) | 305 * 295 = | | 9) 300 * 300 - 5 * 5 = 89975 |
| 10) | 402 * 398 = | | 10) 400 * 400 - 2 * 2 = 159996 |
| 11) | 40 * 51 + 51 * 60 = | | 11) ( 60 + 40) * 51 = 5100 |
| 12) | 47 * 24 + 24 * 153 = | | 12) ( 153 + 47) * 24 = 4800 |
| 13) | 97 * 54 + 97 * 46 = | | 13) ( 46 + 54) * 97 = 9700 |
| 14) | 69 * 159 - 59 * 69 = | | 14) ( 159 - 59) * 69 = 6900 |
| 15) | 160 * 49 - 49 * 60 = | | 15) ( 160 - 60) * 49 = 4900 |
| 16) | 170 * 27 - 27 * 70 = | | 16) ( 170 - 70) * 27 = 2700 |
| 17) | 34 * 54 + 146 * 34 = | | 17) ( 146 + 54) * 34 = 6800 |
| 18) | 81 * 142 - 42 * 81 = | | 18) ( 142 - 42) * 81 = 8100 |
| 19) | 85 * 75 + 125 * 85 = | | 19) ( 125 + 75) * 85 = 17000 |
| 20) | 64 * 132 + 68 * 64 = | | 20) ( 132 + 68) * 64 = 12800 |
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Score: ______________ | |
