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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Sunday August 09 2026
12:57:42 PM | Sunday August 09 2026
12:57:42 PMFlip Answers |
| 1) | 95 * 105 = | | 1) 100 * 100 - 5 * 5 = 9975 |
| 2) | 97 * 103 = | | 2) 100 * 100 - 3 * 3 = 9991 |
| 3) | 207 * 193 = | | 3) 200 * 200 - 7 * 7 = 39951 |
| 4) | 304 * 296 = | | 4) 300 * 300 - 4 * 4 = 89984 |
| 5) | 105 * 95 = | | 5) 100 * 100 - 5 * 5 = 9975 |
| 6) | 303 * 297 = | | 6) 300 * 300 - 3 * 3 = 89991 |
| 7) | 99 * 101 = | | 7) 100 * 100 - 1 * 1 = 9999 |
| 8) | 90 * 110 = | | 8) 100 * 100 - 10 * 10 = 9900 |
| 9) | 195 * 205 = | | 9) 200 * 200 - 5 * 5 = 39975 |
| 10) | 201 * 199 = | | 10) 200 * 200 - 1 * 1 = 39999 |
| 11) | 126 * 68 + 68 * 74 = | | 11) ( 126 + 74) * 68 = 13600 |
| 12) | 52 * 50 + 50 * 52 = | | 12) ( 50 + 50) * 52 = 5200 |
| 13) | 24 * 58 + 42 * 24 = | | 13) ( 58 + 42) * 24 = 2400 |
| 14) | 90 * 237 - 90 * 37 = | | 14) ( 237 - 37) * 90 = 18000 |
| 15) | 94 * 152 - 94 * 52 = | | 15) ( 152 - 52) * 94 = 9400 |
| 16) | 51 * 249 - 51 * 49 = | | 16) ( 249 - 49) * 51 = 10200 |
| 17) | 93 * 47 + 93 * 153 = | | 17) ( 153 + 47) * 93 = 18600 |
| 18) | 70 * 74 + 70 * 126 = | | 18) ( 126 + 74) * 70 = 14000 |
| 19) | 88 * 54 + 88 * 46 = | | 19) ( 46 + 54) * 88 = 8800 |
| 20) | 168 * 45 - 68 * 45 = | | 20) ( 168 - 68) * 45 = 4500 |
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Score: ______________ | |
