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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Saturday April 18 2026
11:59:30 PM | Saturday April 18 2026
11:59:30 PMFlip Answers |
| 1) | 94 * 106 = | | 1) 100 * 100 - 6 * 6 = 9964 |
| 2) | 91 * 109 = | | 2) 100 * 100 - 9 * 9 = 9919 |
| 3) | 199 * 201 = | | 3) 200 * 200 - 1 * 1 = 39999 |
| 4) | 204 * 196 = | | 4) 200 * 200 - 4 * 4 = 39984 |
| 5) | 206 * 194 = | | 5) 200 * 200 - 6 * 6 = 39964 |
| 6) | 205 * 195 = | | 6) 200 * 200 - 5 * 5 = 39975 |
| 7) | 307 * 293 = | | 7) 300 * 300 - 7 * 7 = 89951 |
| 8) | 390 * 410 = | | 8) 400 * 400 - 10 * 10 = 159900 |
| 9) | 110 * 90 = | | 9) 100 * 100 - 10 * 10 = 9900 |
| 10) | 208 * 192 = | | 10) 200 * 200 - 8 * 8 = 39936 |
| 11) | 153 * 67 + 67 * 47 = | | 11) ( 153 + 47) * 67 = 13400 |
| 12) | 83 * 157 + 43 * 83 = | | 12) ( 157 + 43) * 83 = 16600 |
| 13) | 133 * 72 + 72 * 67 = | | 13) ( 133 + 67) * 72 = 14400 |
| 14) | 66 * 235 - 35 * 66 = | | 14) ( 235 - 35) * 66 = 13200 |
| 15) | 81 * 241 - 81 * 41 = | | 15) ( 241 - 41) * 81 = 16200 |
| 16) | 74 * 72 + 28 * 74 = | | 16) ( 28 + 72) * 74 = 7400 |
| 17) | 256 * 33 - 33 * 56 = | | 17) ( 256 - 56) * 33 = 6600 |
| 18) | 27 * 251 - 51 * 27 = | | 18) ( 251 - 51) * 27 = 5400 |
| 19) | 89 * 164 - 64 * 89 = | | 19) ( 164 - 64) * 89 = 8900 |
| 20) | 52 * 22 + 22 * 48 = | | 20) ( 48 + 52) * 22 = 2200 |
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Score: ______________ | |
