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 August 16 2026
07:59:46 PM | Sunday August 16 2026
07:59:46 PMFlip Answers |
| 1) | 195 * 205 = | | 1) 200 * 200 - 5 * 5 = 39975 |
| 2) | 203 * 197 = | | 2) 200 * 200 - 3 * 3 = 39991 |
| 3) | 197 * 203 = | | 3) 200 * 200 - 3 * 3 = 39991 |
| 4) | 108 * 92 = | | 4) 100 * 100 - 8 * 8 = 9936 |
| 5) | 305 * 295 = | | 5) 300 * 300 - 5 * 5 = 89975 |
| 6) | 101 * 99 = | | 6) 100 * 100 - 1 * 1 = 9999 |
| 7) | 105 * 95 = | | 7) 100 * 100 - 5 * 5 = 9975 |
| 8) | 302 * 298 = | | 8) 300 * 300 - 2 * 2 = 89996 |
| 9) | 301 * 299 = | | 9) 300 * 300 - 1 * 1 = 89999 |
| 10) | 192 * 208 = | | 10) 200 * 200 - 8 * 8 = 39936 |
| 11) | 42 * 155 - 55 * 42 = | | 11) ( 155 - 55) * 42 = 4200 |
| 12) | 63 * 141 + 63 * 59 = | | 12) ( 141 + 59) * 63 = 12600 |
| 13) | 243 * 90 - 90 * 43 = | | 13) ( 243 - 43) * 90 = 18000 |
| 14) | 36 * 248 - 48 * 36 = | | 14) ( 248 - 48) * 36 = 7200 |
| 15) | 63 * 55 + 37 * 55 = | | 15) ( 63 + 37) * 55 = 5500 |
| 16) | 64 * 254 - 64 * 54 = | | 16) ( 254 - 54) * 64 = 12800 |
| 17) | 49 * 63 + 49 * 37 = | | 17) ( 37 + 63) * 49 = 4900 |
| 18) | 39 * 46 + 54 * 39 = | | 18) ( 54 + 46) * 39 = 3900 |
| 19) | 27 * 263 - 27 * 63 = | | 19) ( 263 - 63) * 27 = 5400 |
| 20) | 64 * 267 - 64 * 67 = | | 20) ( 267 - 67) * 64 = 12800 |
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Score: ______________ | |
