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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Thursday December 04 2025
06:12:48 AM | Thursday December 04 2025
06:12:48 AMFlip Answers |
| 1) | 106 * 94 = | | 1) 100 * 100 - 6 * 6 = 9964 |
| 2) | 396 * 404 = | | 2) 400 * 400 - 4 * 4 = 159984 |
| 3) | 196 * 204 = | | 3) 200 * 200 - 4 * 4 = 39984 |
| 4) | 104 * 96 = | | 4) 100 * 100 - 4 * 4 = 9984 |
| 5) | 397 * 403 = | | 5) 400 * 400 - 3 * 3 = 159991 |
| 6) | 107 * 93 = | | 6) 100 * 100 - 7 * 7 = 9951 |
| 7) | 107 * 93 = | | 7) 100 * 100 - 7 * 7 = 9951 |
| 8) | 297 * 303 = | | 8) 300 * 300 - 3 * 3 = 89991 |
| 9) | 210 * 190 = | | 9) 200 * 200 - 10 * 10 = 39900 |
| 10) | 391 * 409 = | | 10) 400 * 400 - 9 * 9 = 159919 |
| 11) | 73 * 37 + 163 * 73 = | | 11) ( 163 + 37) * 73 = 14600 |
| 12) | 35 * 67 + 165 * 67 = | | 12) ( 165 + 35) * 67 = 13400 |
| 13) | 31 * 254 - 31 * 54 = | | 13) ( 254 - 54) * 31 = 6200 |
| 14) | 58 * 79 + 79 * 142 = | | 14) ( 142 + 58) * 79 = 15800 |
| 15) | 73 * 26 + 26 * 27 = | | 15) ( 27 + 73) * 26 = 2600 |
| 16) | 62 * 156 - 62 * 56 = | | 16) ( 156 - 56) * 62 = 6200 |
| 17) | 239 * 24 - 24 * 39 = | | 17) ( 239 - 39) * 24 = 4800 |
| 18) | 36 * 128 + 72 * 36 = | | 18) ( 128 + 72) * 36 = 7200 |
| 19) | 78 * 175 - 75 * 78 = | | 19) ( 175 - 75) * 78 = 7800 |
| 20) | 73 * 53 + 47 * 73 = | | 20) ( 53 + 47) * 73 = 7300 |
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Score: ______________ | |
