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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Tuesday April 23 2024
02:28:14 AM | Tuesday April 23 2024
02:28:14 AMFlip Answers |
| 1) | 303 * 297 = | | 1) 300 * 300 - 3 * 3 = 89991 |
| 2) | 299 * 301 = | | 2) 300 * 300 - 1 * 1 = 89999 |
| 3) | 105 * 95 = | | 3) 100 * 100 - 5 * 5 = 9975 |
| 4) | 401 * 399 = | | 4) 400 * 400 - 1 * 1 = 159999 |
| 5) | 101 * 99 = | | 5) 100 * 100 - 1 * 1 = 9999 |
| 6) | 398 * 402 = | | 6) 400 * 400 - 2 * 2 = 159996 |
| 7) | 305 * 295 = | | 7) 300 * 300 - 5 * 5 = 89975 |
| 8) | 192 * 208 = | | 8) 200 * 200 - 8 * 8 = 39936 |
| 9) | 90 * 110 = | | 9) 100 * 100 - 10 * 10 = 9900 |
| 10) | 106 * 94 = | | 10) 100 * 100 - 6 * 6 = 9964 |
| 11) | 260 * 59 - 60 * 59 = | | 11) ( 260 - 60) * 59 = 11800 |
| 12) | 65 * 28 + 35 * 28 = | | 12) ( 65 + 35) * 28 = 2800 |
| 13) | 37 * 22 + 63 * 22 = | | 13) ( 63 + 37) * 22 = 2200 |
| 14) | 86 * 43 + 157 * 86 = | | 14) ( 157 + 43) * 86 = 17200 |
| 15) | 80 * 150 - 80 * 50 = | | 15) ( 150 - 50) * 80 = 8000 |
| 16) | 265 * 28 - 65 * 28 = | | 16) ( 265 - 65) * 28 = 5600 |
| 17) | 162 * 37 + 38 * 37 = | | 17) ( 162 + 38) * 37 = 7400 |
| 18) | 78 * 69 + 31 * 78 = | | 18) ( 31 + 69) * 78 = 7800 |
| 19) | 70 * 31 + 69 * 70 = | | 19) ( 31 + 69) * 70 = 7000 |
| 20) | 48 * 49 + 49 * 52 = | | 20) ( 48 + 52) * 49 = 4900 |
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Score: ______________ | |
