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 May 20 2026
06:20:26 PM | Wednesday May 20 2026
06:20:26 PMFlip Answers |
| 1) | 107 * 93 = | | 1) 100 * 100 - 7 * 7 = 9951 |
| 2) | 202 * 198 = | | 2) 200 * 200 - 2 * 2 = 39996 |
| 3) | 303 * 297 = | | 3) 300 * 300 - 3 * 3 = 89991 |
| 4) | 403 * 397 = | | 4) 400 * 400 - 3 * 3 = 159991 |
| 5) | 190 * 210 = | | 5) 200 * 200 - 10 * 10 = 39900 |
| 6) | 102 * 98 = | | 6) 100 * 100 - 2 * 2 = 9996 |
| 7) | 102 * 98 = | | 7) 100 * 100 - 2 * 2 = 9996 |
| 8) | 292 * 308 = | | 8) 300 * 300 - 8 * 8 = 89936 |
| 9) | 205 * 195 = | | 9) 200 * 200 - 5 * 5 = 39975 |
| 10) | 104 * 96 = | | 10) 100 * 100 - 4 * 4 = 9984 |
| 11) | 264 * 26 - 64 * 26 = | | 11) ( 264 - 64) * 26 = 5200 |
| 12) | 96 * 58 + 42 * 96 = | | 12) ( 42 + 58) * 96 = 9600 |
| 13) | 55 * 27 + 73 * 55 = | | 13) ( 27 + 73) * 55 = 5500 |
| 14) | 57 * 21 + 21 * 43 = | | 14) ( 57 + 43) * 21 = 2100 |
| 15) | 88 * 63 + 88 * 37 = | | 15) ( 63 + 37) * 88 = 8800 |
| 16) | 82 * 44 + 56 * 82 = | | 16) ( 44 + 56) * 82 = 8200 |
| 17) | 47 * 149 + 47 * 51 = | | 17) ( 149 + 51) * 47 = 9400 |
| 18) | 47 * 154 - 47 * 54 = | | 18) ( 154 - 54) * 47 = 4700 |
| 19) | 32 * 31 + 68 * 31 = | | 19) ( 32 + 68) * 31 = 3100 |
| 20) | 36 * 165 - 65 * 36 = | | 20) ( 165 - 65) * 36 = 3600 |
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Score: ______________ | |
