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 November 05 2026
12:42:37 PM | Thursday November 05 2026
12:42:37 PMFlip Answers |
| 1) | 203 * 197 = | | 1) 200 * 200 - 3 * 3 = 39991 |
| 2) | 98 * 102 = | | 2) 100 * 100 - 2 * 2 = 9996 |
| 3) | 203 * 197 = | | 3) 200 * 200 - 3 * 3 = 39991 |
| 4) | 197 * 203 = | | 4) 200 * 200 - 3 * 3 = 39991 |
| 5) | 203 * 197 = | | 5) 200 * 200 - 3 * 3 = 39991 |
| 6) | 106 * 94 = | | 6) 100 * 100 - 6 * 6 = 9964 |
| 7) | 294 * 306 = | | 7) 300 * 300 - 6 * 6 = 89964 |
| 8) | 395 * 405 = | | 8) 400 * 400 - 5 * 5 = 159975 |
| 9) | 192 * 208 = | | 9) 200 * 200 - 8 * 8 = 39936 |
| 10) | 106 * 94 = | | 10) 100 * 100 - 6 * 6 = 9964 |
| 11) | 145 * 90 - 45 * 90 = | | 11) ( 145 - 45) * 90 = 9000 |
| 12) | 81 * 133 + 67 * 81 = | | 12) ( 133 + 67) * 81 = 16200 |
| 13) | 38 * 271 - 71 * 38 = | | 13) ( 271 - 71) * 38 = 7600 |
| 14) | 65 * 90 + 90 * 135 = | | 14) ( 135 + 65) * 90 = 18000 |
| 15) | 28 * 275 - 75 * 28 = | | 15) ( 275 - 75) * 28 = 5600 |
| 16) | 244 * 62 - 62 * 44 = | | 16) ( 244 - 44) * 62 = 12400 |
| 17) | 260 * 91 - 91 * 60 = | | 17) ( 260 - 60) * 91 = 18200 |
| 18) | 25 * 50 + 150 * 25 = | | 18) ( 150 + 50) * 25 = 5000 |
| 19) | 235 * 61 - 35 * 61 = | | 19) ( 235 - 35) * 61 = 12200 |
| 20) | 69 * 31 + 69 * 69 = | | 20) ( 31 + 69) * 69 = 6900 |
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Score: ______________ | |
