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 October 26 2026
06:56:08 AM | Monday October 26 2026
06:56:08 AMFlip Answers |
| 1) | 305 * 295 = | | 1) 300 * 300 - 5 * 5 = 89975 |
| 2) | 110 * 90 = | | 2) 100 * 100 - 10 * 10 = 9900 |
| 3) | 305 * 295 = | | 3) 300 * 300 - 5 * 5 = 89975 |
| 4) | 201 * 199 = | | 4) 200 * 200 - 1 * 1 = 39999 |
| 5) | 295 * 305 = | | 5) 300 * 300 - 5 * 5 = 89975 |
| 6) | 205 * 195 = | | 6) 200 * 200 - 5 * 5 = 39975 |
| 7) | 204 * 196 = | | 7) 200 * 200 - 4 * 4 = 39984 |
| 8) | 390 * 410 = | | 8) 400 * 400 - 10 * 10 = 159900 |
| 9) | 207 * 193 = | | 9) 200 * 200 - 7 * 7 = 39951 |
| 10) | 105 * 95 = | | 10) 100 * 100 - 5 * 5 = 9975 |
| 11) | 168 * 57 - 68 * 57 = | | 11) ( 168 - 68) * 57 = 5700 |
| 12) | 89 * 134 + 66 * 89 = | | 12) ( 134 + 66) * 89 = 17800 |
| 13) | 153 * 41 - 53 * 41 = | | 13) ( 153 - 53) * 41 = 4100 |
| 14) | 147 * 75 - 75 * 47 = | | 14) ( 147 - 47) * 75 = 7500 |
| 15) | 158 * 83 - 58 * 83 = | | 15) ( 158 - 58) * 83 = 8300 |
| 16) | 153 * 70 - 53 * 70 = | | 16) ( 153 - 53) * 70 = 7000 |
| 17) | 162 * 36 - 62 * 36 = | | 17) ( 162 - 62) * 36 = 3600 |
| 18) | 27 * 36 + 164 * 27 = | | 18) ( 164 + 36) * 27 = 5400 |
| 19) | 171 * 93 - 71 * 93 = | | 19) ( 171 - 71) * 93 = 9300 |
| 20) | 65 * 50 + 50 * 65 = | | 20) ( 50 + 50) * 65 = 6500 |
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Score: ______________ | |
