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 November 17 2025
02:59:22 PM | Monday November 17 2025
02:59:22 PMFlip Answers |
| 1) | 204 * 196 = | | 1) 200 * 200 - 4 * 4 = 39984 |
| 2) | 91 * 109 = | | 2) 100 * 100 - 9 * 9 = 9919 |
| 3) | 110 * 90 = | | 3) 100 * 100 - 10 * 10 = 9900 |
| 4) | 91 * 109 = | | 4) 100 * 100 - 9 * 9 = 9919 |
| 5) | 93 * 107 = | | 5) 100 * 100 - 7 * 7 = 9951 |
| 6) | 295 * 305 = | | 6) 300 * 300 - 5 * 5 = 89975 |
| 7) | 293 * 307 = | | 7) 300 * 300 - 7 * 7 = 89951 |
| 8) | 106 * 94 = | | 8) 100 * 100 - 6 * 6 = 9964 |
| 9) | 205 * 195 = | | 9) 200 * 200 - 5 * 5 = 39975 |
| 10) | 206 * 194 = | | 10) 200 * 200 - 6 * 6 = 39964 |
| 11) | 97 * 152 - 52 * 97 = | | 11) ( 152 - 52) * 97 = 9700 |
| 12) | 81 * 275 - 75 * 81 = | | 12) ( 275 - 75) * 81 = 16200 |
| 13) | 45 * 139 - 45 * 39 = | | 13) ( 139 - 39) * 45 = 4500 |
| 14) | 269 * 89 - 89 * 69 = | | 14) ( 269 - 69) * 89 = 17800 |
| 15) | 35 * 138 - 35 * 38 = | | 15) ( 138 - 38) * 35 = 3500 |
| 16) | 34 * 58 + 66 * 58 = | | 16) ( 34 + 66) * 58 = 5800 |
| 17) | 80 * 67 + 80 * 33 = | | 17) ( 33 + 67) * 80 = 8000 |
| 18) | 157 * 93 - 93 * 57 = | | 18) ( 157 - 57) * 93 = 9300 |
| 19) | 158 * 72 - 72 * 58 = | | 19) ( 158 - 58) * 72 = 7200 |
| 20) | 49 * 257 - 49 * 57 = | | 20) ( 257 - 57) * 49 = 9800 |
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Score: ______________ | |
