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 June 30 2026
04:55:26 PM | Tuesday June 30 2026
04:55:26 PMFlip Answers |
| 1) | 199 * 201 = | | 1) 200 * 200 - 1 * 1 = 39999 |
| 2) | 408 * 392 = | | 2) 400 * 400 - 8 * 8 = 159936 |
| 3) | 99 * 101 = | | 3) 100 * 100 - 1 * 1 = 9999 |
| 4) | 406 * 394 = | | 4) 400 * 400 - 6 * 6 = 159964 |
| 5) | 408 * 392 = | | 5) 400 * 400 - 8 * 8 = 159936 |
| 6) | 96 * 104 = | | 6) 100 * 100 - 4 * 4 = 9984 |
| 7) | 304 * 296 = | | 7) 300 * 300 - 4 * 4 = 89984 |
| 8) | 403 * 397 = | | 8) 400 * 400 - 3 * 3 = 159991 |
| 9) | 93 * 107 = | | 9) 100 * 100 - 7 * 7 = 9951 |
| 10) | 102 * 98 = | | 10) 100 * 100 - 2 * 2 = 9996 |
| 11) | 37 * 37 + 37 * 63 = | | 11) ( 37 + 63) * 37 = 3700 |
| 12) | 54 * 70 + 70 * 46 = | | 12) ( 54 + 46) * 70 = 7000 |
| 13) | 240 * 53 - 40 * 53 = | | 13) ( 240 - 40) * 53 = 10600 |
| 14) | 274 * 29 - 29 * 74 = | | 14) ( 274 - 74) * 29 = 5800 |
| 15) | 53 * 142 + 58 * 53 = | | 15) ( 142 + 58) * 53 = 10600 |
| 16) | 70 * 63 + 130 * 63 = | | 16) ( 130 + 70) * 63 = 12600 |
| 17) | 55 * 92 + 92 * 45 = | | 17) ( 45 + 55) * 92 = 9200 |
| 18) | 151 * 41 - 41 * 51 = | | 18) ( 151 - 51) * 41 = 4100 |
| 19) | 70 * 68 + 70 * 132 = | | 19) ( 132 + 68) * 70 = 14000 |
| 20) | 36 * 66 + 66 * 64 = | | 20) ( 64 + 36) * 66 = 6600 |
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Score: ______________ | |
