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 March 08 2026
03:18:07 AM | Sunday March 08 2026
03:18:07 AMFlip Answers |
| 1) | 96 * 104 = | | 1) 100 * 100 - 4 * 4 = 9984 |
| 2) | 98 * 102 = | | 2) 100 * 100 - 2 * 2 = 9996 |
| 3) | 298 * 302 = | | 3) 300 * 300 - 2 * 2 = 89996 |
| 4) | 409 * 391 = | | 4) 400 * 400 - 9 * 9 = 159919 |
| 5) | 206 * 194 = | | 5) 200 * 200 - 6 * 6 = 39964 |
| 6) | 90 * 110 = | | 6) 100 * 100 - 10 * 10 = 9900 |
| 7) | 99 * 101 = | | 7) 100 * 100 - 1 * 1 = 9999 |
| 8) | 91 * 109 = | | 8) 100 * 100 - 9 * 9 = 9919 |
| 9) | 405 * 395 = | | 9) 400 * 400 - 5 * 5 = 159975 |
| 10) | 209 * 191 = | | 10) 200 * 200 - 9 * 9 = 39919 |
| 11) | 67 * 140 + 67 * 60 = | | 11) ( 140 + 60) * 67 = 13400 |
| 12) | 26 * 32 + 32 * 74 = | | 12) ( 26 + 74) * 32 = 3200 |
| 13) | 168 * 75 - 75 * 68 = | | 13) ( 168 - 68) * 75 = 7500 |
| 14) | 269 * 57 - 69 * 57 = | | 14) ( 269 - 69) * 57 = 11400 |
| 15) | 64 * 142 + 58 * 64 = | | 15) ( 142 + 58) * 64 = 12800 |
| 16) | 58 * 34 + 42 * 34 = | | 16) ( 42 + 58) * 34 = 3400 |
| 17) | 256 * 39 - 39 * 56 = | | 17) ( 256 - 56) * 39 = 7800 |
| 18) | 143 * 79 + 57 * 79 = | | 18) ( 143 + 57) * 79 = 15800 |
| 19) | 153 * 44 - 44 * 53 = | | 19) ( 153 - 53) * 44 = 4400 |
| 20) | 93 * 41 + 159 * 93 = | | 20) ( 159 + 41) * 93 = 18600 |
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Score: ______________ | |
