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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Wednesday July 29 2026
12:59:12 AM | Wednesday July 29 2026
12:59:12 AMFlip Answers |
| 1) | 93 * 107 = | | 1) 100 * 100 - 7 * 7 = 9951 |
| 2) | 393 * 407 = | | 2) 400 * 400 - 7 * 7 = 159951 |
| 3) | 109 * 91 = | | 3) 100 * 100 - 9 * 9 = 9919 |
| 4) | 192 * 208 = | | 4) 200 * 200 - 8 * 8 = 39936 |
| 5) | 398 * 402 = | | 5) 400 * 400 - 2 * 2 = 159996 |
| 6) | 402 * 398 = | | 6) 400 * 400 - 2 * 2 = 159996 |
| 7) | 296 * 304 = | | 7) 300 * 300 - 4 * 4 = 89984 |
| 8) | 99 * 101 = | | 8) 100 * 100 - 1 * 1 = 9999 |
| 9) | 296 * 304 = | | 9) 300 * 300 - 4 * 4 = 89984 |
| 10) | 310 * 290 = | | 10) 300 * 300 - 10 * 10 = 89900 |
| 11) | 47 * 78 + 78 * 53 = | | 11) ( 53 + 47) * 78 = 7800 |
| 12) | 248 * 93 - 48 * 93 = | | 12) ( 248 - 48) * 93 = 18600 |
| 13) | 62 * 135 - 35 * 62 = | | 13) ( 135 - 35) * 62 = 6200 |
| 14) | 270 * 35 - 70 * 35 = | | 14) ( 270 - 70) * 35 = 7000 |
| 15) | 174 * 55 - 55 * 74 = | | 15) ( 174 - 74) * 55 = 5500 |
| 16) | 79 * 158 - 58 * 79 = | | 16) ( 158 - 58) * 79 = 7900 |
| 17) | 152 * 40 + 48 * 40 = | | 17) ( 152 + 48) * 40 = 8000 |
| 18) | 237 * 26 - 26 * 37 = | | 18) ( 237 - 37) * 26 = 5200 |
| 19) | 85 * 45 + 55 * 85 = | | 19) ( 55 + 45) * 85 = 8500 |
| 20) | 75 * 236 - 75 * 36 = | | 20) ( 236 - 36) * 75 = 15000 |
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Score: ______________ | |
