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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Wednesday September 02 2026
11:55:58 AM | Wednesday September 02 2026
11:55:58 AMFlip Answers |
| 1) | 196 * 204 = | | 1) 200 * 200 - 4 * 4 = 39984 |
| 2) | 106 * 94 = | | 2) 100 * 100 - 6 * 6 = 9964 |
| 3) | 110 * 90 = | | 3) 100 * 100 - 10 * 10 = 9900 |
| 4) | 403 * 397 = | | 4) 400 * 400 - 3 * 3 = 159991 |
| 5) | 397 * 403 = | | 5) 400 * 400 - 3 * 3 = 159991 |
| 6) | 98 * 102 = | | 6) 100 * 100 - 2 * 2 = 9996 |
| 7) | 404 * 396 = | | 7) 400 * 400 - 4 * 4 = 159984 |
| 8) | 290 * 310 = | | 8) 300 * 300 - 10 * 10 = 89900 |
| 9) | 194 * 206 = | | 9) 200 * 200 - 6 * 6 = 39964 |
| 10) | 208 * 192 = | | 10) 200 * 200 - 8 * 8 = 39936 |
| 11) | 71 * 33 + 33 * 129 = | | 11) ( 129 + 71) * 33 = 6600 |
| 12) | 54 * 92 + 46 * 92 = | | 12) ( 46 + 54) * 92 = 9200 |
| 13) | 77 * 239 - 39 * 77 = | | 13) ( 239 - 39) * 77 = 15400 |
| 14) | 149 * 54 - 49 * 54 = | | 14) ( 149 - 49) * 54 = 5400 |
| 15) | 173 * 76 - 73 * 76 = | | 15) ( 173 - 73) * 76 = 7600 |
| 16) | 27 * 61 + 27 * 39 = | | 16) ( 61 + 39) * 27 = 2700 |
| 17) | 80 * 41 + 80 * 59 = | | 17) ( 41 + 59) * 80 = 8000 |
| 18) | 52 * 157 + 43 * 52 = | | 18) ( 157 + 43) * 52 = 10400 |
| 19) | 46 * 139 - 46 * 39 = | | 19) ( 139 - 39) * 46 = 4600 |
| 20) | 146 * 93 + 93 * 54 = | | 20) ( 146 + 54) * 93 = 18600 |
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Score: ______________ | |
