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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Sunday February 01 2026
02:20:42 AM | Sunday February 01 2026
02:20:42 AMFlip Answers |
| 1) | 208 * 192 = | | 1) 200 * 200 - 8 * 8 = 39936 |
| 2) | 398 * 402 = | | 2) 400 * 400 - 2 * 2 = 159996 |
| 3) | 96 * 104 = | | 3) 100 * 100 - 4 * 4 = 9984 |
| 4) | 99 * 101 = | | 4) 100 * 100 - 1 * 1 = 9999 |
| 5) | 306 * 294 = | | 5) 300 * 300 - 6 * 6 = 89964 |
| 6) | 303 * 297 = | | 6) 300 * 300 - 3 * 3 = 89991 |
| 7) | 203 * 197 = | | 7) 200 * 200 - 3 * 3 = 39991 |
| 8) | 292 * 308 = | | 8) 300 * 300 - 8 * 8 = 89936 |
| 9) | 390 * 410 = | | 9) 400 * 400 - 10 * 10 = 159900 |
| 10) | 402 * 398 = | | 10) 400 * 400 - 2 * 2 = 159996 |
| 11) | 158 * 63 - 63 * 58 = | | 11) ( 158 - 58) * 63 = 6300 |
| 12) | 266 * 41 - 41 * 66 = | | 12) ( 266 - 66) * 41 = 8200 |
| 13) | 147 * 60 + 53 * 60 = | | 13) ( 147 + 53) * 60 = 12000 |
| 14) | 261 * 87 - 61 * 87 = | | 14) ( 261 - 61) * 87 = 17400 |
| 15) | 32 * 75 + 75 * 68 = | | 15) ( 32 + 68) * 75 = 7500 |
| 16) | 28 * 235 - 35 * 28 = | | 16) ( 235 - 35) * 28 = 5600 |
| 17) | 29 * 143 + 29 * 57 = | | 17) ( 143 + 57) * 29 = 5800 |
| 18) | 64 * 76 + 136 * 76 = | | 18) ( 136 + 64) * 76 = 15200 |
| 19) | 265 * 87 - 65 * 87 = | | 19) ( 265 - 65) * 87 = 17400 |
| 20) | 69 * 21 + 31 * 21 = | | 20) ( 31 + 69) * 21 = 2100 |
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Score: ______________ | |
