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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Thursday October 29 2026
07:41:36 AM | Thursday October 29 2026
07:41:36 AMFlip Answers |
| 1) | 108 * 92 = | | 1) 100 * 100 - 8 * 8 = 9936 |
| 2) | 393 * 407 = | | 2) 400 * 400 - 7 * 7 = 159951 |
| 3) | 309 * 291 = | | 3) 300 * 300 - 9 * 9 = 89919 |
| 4) | 207 * 193 = | | 4) 200 * 200 - 7 * 7 = 39951 |
| 5) | 303 * 297 = | | 5) 300 * 300 - 3 * 3 = 89991 |
| 6) | 210 * 190 = | | 6) 200 * 200 - 10 * 10 = 39900 |
| 7) | 198 * 202 = | | 7) 200 * 200 - 2 * 2 = 39996 |
| 8) | 405 * 395 = | | 8) 400 * 400 - 5 * 5 = 159975 |
| 9) | 208 * 192 = | | 9) 200 * 200 - 8 * 8 = 39936 |
| 10) | 297 * 303 = | | 10) 300 * 300 - 3 * 3 = 89991 |
| 11) | 65 * 267 - 65 * 67 = | | 11) ( 267 - 67) * 65 = 13000 |
| 12) | 65 * 52 + 48 * 65 = | | 12) ( 48 + 52) * 65 = 6500 |
| 13) | 70 * 49 + 151 * 70 = | | 13) ( 151 + 49) * 70 = 14000 |
| 14) | 126 * 81 + 74 * 81 = | | 14) ( 126 + 74) * 81 = 16200 |
| 15) | 166 * 29 - 29 * 66 = | | 15) ( 166 - 66) * 29 = 2900 |
| 16) | 239 * 51 - 51 * 39 = | | 16) ( 239 - 39) * 51 = 10200 |
| 17) | 159 * 32 - 32 * 59 = | | 17) ( 159 - 59) * 32 = 3200 |
| 18) | 43 * 57 + 57 * 57 = | | 18) ( 43 + 57) * 57 = 5700 |
| 19) | 35 * 43 + 35 * 57 = | | 19) ( 57 + 43) * 35 = 3500 |
| 20) | 235 * 71 - 71 * 35 = | | 20) ( 235 - 35) * 71 = 14200 |
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Score: ______________ | |
