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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Friday December 12 2025
01:07:21 AM | Friday December 12 2025
01:07:21 AMFlip Answers |
| 1) | 202 * 198 = | | 1) 200 * 200 - 2 * 2 = 39996 |
| 2) | 305 * 295 = | | 2) 300 * 300 - 5 * 5 = 89975 |
| 3) | 304 * 296 = | | 3) 300 * 300 - 4 * 4 = 89984 |
| 4) | 393 * 407 = | | 4) 400 * 400 - 7 * 7 = 159951 |
| 5) | 198 * 202 = | | 5) 200 * 200 - 2 * 2 = 39996 |
| 6) | 94 * 106 = | | 6) 100 * 100 - 6 * 6 = 9964 |
| 7) | 404 * 396 = | | 7) 400 * 400 - 4 * 4 = 159984 |
| 8) | 206 * 194 = | | 8) 200 * 200 - 6 * 6 = 39964 |
| 9) | 294 * 306 = | | 9) 300 * 300 - 6 * 6 = 89964 |
| 10) | 290 * 310 = | | 10) 300 * 300 - 10 * 10 = 89900 |
| 11) | 265 * 30 - 65 * 30 = | | 11) ( 265 - 65) * 30 = 6000 |
| 12) | 169 * 87 - 87 * 69 = | | 12) ( 169 - 69) * 87 = 8700 |
| 13) | 51 * 35 + 35 * 49 = | | 13) ( 49 + 51) * 35 = 3500 |
| 14) | 138 * 73 - 38 * 73 = | | 14) ( 138 - 38) * 73 = 7300 |
| 15) | 81 * 58 + 81 * 42 = | | 15) ( 42 + 58) * 81 = 8100 |
| 16) | 64 * 146 + 54 * 64 = | | 16) ( 146 + 54) * 64 = 12800 |
| 17) | 28 * 247 - 28 * 47 = | | 17) ( 247 - 47) * 28 = 5600 |
| 18) | 51 * 152 - 52 * 51 = | | 18) ( 152 - 52) * 51 = 5100 |
| 19) | 141 * 76 - 41 * 76 = | | 19) ( 141 - 41) * 76 = 7600 |
| 20) | 61 * 46 + 61 * 54 = | | 20) ( 54 + 46) * 61 = 6100 |
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Score: ______________ | |
