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 June 25 2026
12:11:28 PM | Thursday June 25 2026
12:11:28 PMFlip Answers |
| 1) | 107 * 93 = | | 1) 100 * 100 - 7 * 7 = 9951 |
| 2) | 193 * 207 = | | 2) 200 * 200 - 7 * 7 = 39951 |
| 3) | 97 * 103 = | | 3) 100 * 100 - 3 * 3 = 9991 |
| 4) | 207 * 193 = | | 4) 200 * 200 - 7 * 7 = 39951 |
| 5) | 104 * 96 = | | 5) 100 * 100 - 4 * 4 = 9984 |
| 6) | 196 * 204 = | | 6) 200 * 200 - 4 * 4 = 39984 |
| 7) | 397 * 403 = | | 7) 400 * 400 - 3 * 3 = 159991 |
| 8) | 206 * 194 = | | 8) 200 * 200 - 6 * 6 = 39964 |
| 9) | 401 * 399 = | | 9) 400 * 400 - 1 * 1 = 159999 |
| 10) | 110 * 90 = | | 10) 100 * 100 - 10 * 10 = 9900 |
| 11) | 156 * 95 - 56 * 95 = | | 11) ( 156 - 56) * 95 = 9500 |
| 12) | 76 * 152 - 76 * 52 = | | 12) ( 152 - 52) * 76 = 7600 |
| 13) | 55 * 272 - 72 * 55 = | | 13) ( 272 - 72) * 55 = 11000 |
| 14) | 165 * 87 + 87 * 35 = | | 14) ( 165 + 35) * 87 = 17400 |
| 15) | 144 * 40 + 40 * 56 = | | 15) ( 144 + 56) * 40 = 8000 |
| 16) | 71 * 56 + 71 * 144 = | | 16) ( 144 + 56) * 71 = 14200 |
| 17) | 53 * 237 - 37 * 53 = | | 17) ( 237 - 37) * 53 = 10600 |
| 18) | 59 * 74 + 141 * 74 = | | 18) ( 141 + 59) * 74 = 14800 |
| 19) | 61 * 174 - 74 * 61 = | | 19) ( 174 - 74) * 61 = 6100 |
| 20) | 37 * 64 + 36 * 37 = | | 20) ( 64 + 36) * 37 = 3700 |
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Score: ______________ | |
