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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Friday March 13 2026
08:34:00 AM | Friday March 13 2026
08:34:00 AMFlip Answers |
| 1) | 102 * 98 = | | 1) 100 * 100 - 2 * 2 = 9996 |
| 2) | 407 * 393 = | | 2) 400 * 400 - 7 * 7 = 159951 |
| 3) | 409 * 391 = | | 3) 400 * 400 - 9 * 9 = 159919 |
| 4) | 98 * 102 = | | 4) 100 * 100 - 2 * 2 = 9996 |
| 5) | 99 * 101 = | | 5) 100 * 100 - 1 * 1 = 9999 |
| 6) | 308 * 292 = | | 6) 300 * 300 - 8 * 8 = 89936 |
| 7) | 108 * 92 = | | 7) 100 * 100 - 8 * 8 = 9936 |
| 8) | 106 * 94 = | | 8) 100 * 100 - 6 * 6 = 9964 |
| 9) | 99 * 101 = | | 9) 100 * 100 - 1 * 1 = 9999 |
| 10) | 103 * 97 = | | 10) 100 * 100 - 3 * 3 = 9991 |
| 11) | 39 * 130 + 39 * 70 = | | 11) ( 130 + 70) * 39 = 7800 |
| 12) | 78 * 241 - 41 * 78 = | | 12) ( 241 - 41) * 78 = 15600 |
| 13) | 44 * 41 + 41 * 156 = | | 13) ( 156 + 44) * 41 = 8200 |
| 14) | 63 * 163 - 63 * 63 = | | 14) ( 163 - 63) * 63 = 6300 |
| 15) | 53 * 44 + 147 * 44 = | | 15) ( 147 + 53) * 44 = 8800 |
| 16) | 136 * 40 + 40 * 64 = | | 16) ( 136 + 64) * 40 = 8000 |
| 17) | 44 * 255 - 55 * 44 = | | 17) ( 255 - 55) * 44 = 8800 |
| 18) | 41 * 35 + 41 * 65 = | | 18) ( 35 + 65) * 41 = 4100 |
| 19) | 36 * 66 + 36 * 34 = | | 19) ( 34 + 66) * 36 = 3600 |
| 20) | 62 * 135 - 35 * 62 = | | 20) ( 135 - 35) * 62 = 6200 |
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Score: ______________ | |
