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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Monday January 26 2026
02:29:50 AM | Monday January 26 2026
02:29:50 AMFlip Answers |
| 1) | 96 * 104 = | | 1) 100 * 100 - 4 * 4 = 9984 |
| 2) | 303 * 297 = | | 2) 300 * 300 - 3 * 3 = 89991 |
| 3) | 196 * 204 = | | 3) 200 * 200 - 4 * 4 = 39984 |
| 4) | 99 * 101 = | | 4) 100 * 100 - 1 * 1 = 9999 |
| 5) | 95 * 105 = | | 5) 100 * 100 - 5 * 5 = 9975 |
| 6) | 94 * 106 = | | 6) 100 * 100 - 6 * 6 = 9964 |
| 7) | 404 * 396 = | | 7) 400 * 400 - 4 * 4 = 159984 |
| 8) | 394 * 406 = | | 8) 400 * 400 - 6 * 6 = 159964 |
| 9) | 197 * 203 = | | 9) 200 * 200 - 3 * 3 = 39991 |
| 10) | 206 * 194 = | | 10) 200 * 200 - 6 * 6 = 39964 |
| 11) | 167 * 91 - 91 * 67 = | | 11) ( 167 - 67) * 91 = 9100 |
| 12) | 45 * 87 + 155 * 87 = | | 12) ( 155 + 45) * 87 = 17400 |
| 13) | 143 * 82 + 82 * 57 = | | 13) ( 143 + 57) * 82 = 16400 |
| 14) | 82 * 129 + 71 * 82 = | | 14) ( 129 + 71) * 82 = 16400 |
| 15) | 83 * 175 - 83 * 75 = | | 15) ( 175 - 75) * 83 = 8300 |
| 16) | 271 * 73 - 71 * 73 = | | 16) ( 271 - 71) * 73 = 14600 |
| 17) | 76 * 255 - 55 * 76 = | | 17) ( 255 - 55) * 76 = 15200 |
| 18) | 69 * 173 - 69 * 73 = | | 18) ( 173 - 73) * 69 = 6900 |
| 19) | 42 * 90 + 90 * 158 = | | 19) ( 158 + 42) * 90 = 18000 |
| 20) | 48 * 48 + 52 * 48 = | | 20) ( 48 + 52) * 48 = 4800 |
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Score: ______________ | |
