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 November 26 2025
09:34:52 AM | Wednesday November 26 2025
09:34:52 AMFlip Answers |
| 1) | 290 * 310 = | | 1) 300 * 300 - 10 * 10 = 89900 |
| 2) | 199 * 201 = | | 2) 200 * 200 - 1 * 1 = 39999 |
| 3) | 306 * 294 = | | 3) 300 * 300 - 6 * 6 = 89964 |
| 4) | 392 * 408 = | | 4) 400 * 400 - 8 * 8 = 159936 |
| 5) | 206 * 194 = | | 5) 200 * 200 - 6 * 6 = 39964 |
| 6) | 90 * 110 = | | 6) 100 * 100 - 10 * 10 = 9900 |
| 7) | 299 * 301 = | | 7) 300 * 300 - 1 * 1 = 89999 |
| 8) | 109 * 91 = | | 8) 100 * 100 - 9 * 9 = 9919 |
| 9) | 106 * 94 = | | 9) 100 * 100 - 6 * 6 = 9964 |
| 10) | 208 * 192 = | | 10) 200 * 200 - 8 * 8 = 39936 |
| 11) | 67 * 33 + 67 * 67 = | | 11) ( 33 + 67) * 67 = 6700 |
| 12) | 88 * 46 + 154 * 88 = | | 12) ( 154 + 46) * 88 = 17600 |
| 13) | 72 * 172 - 72 * 72 = | | 13) ( 172 - 72) * 72 = 7200 |
| 14) | 47 * 60 + 53 * 60 = | | 14) ( 53 + 47) * 60 = 6000 |
| 15) | 256 * 65 - 65 * 56 = | | 15) ( 256 - 56) * 65 = 13000 |
| 16) | 58 * 54 + 146 * 58 = | | 16) ( 146 + 54) * 58 = 11600 |
| 17) | 81 * 156 - 81 * 56 = | | 17) ( 156 - 56) * 81 = 8100 |
| 18) | 271 * 50 - 50 * 71 = | | 18) ( 271 - 71) * 50 = 10000 |
| 19) | 49 * 241 - 41 * 49 = | | 19) ( 241 - 41) * 49 = 9800 |
| 20) | 81 * 49 + 151 * 81 = | | 20) ( 151 + 49) * 81 = 16200 |
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Score: ______________ | |
