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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Thursday May 21 2026
06:55:09 PM | Thursday May 21 2026
06:55:09 PMFlip Answers |
| 1) | 308 * 292 = | | 1) 300 * 300 - 8 * 8 = 89936 |
| 2) | 305 * 295 = | | 2) 300 * 300 - 5 * 5 = 89975 |
| 3) | 102 * 98 = | | 3) 100 * 100 - 2 * 2 = 9996 |
| 4) | 296 * 304 = | | 4) 300 * 300 - 4 * 4 = 89984 |
| 5) | 190 * 210 = | | 5) 200 * 200 - 10 * 10 = 39900 |
| 6) | 310 * 290 = | | 6) 300 * 300 - 10 * 10 = 89900 |
| 7) | 95 * 105 = | | 7) 100 * 100 - 5 * 5 = 9975 |
| 8) | 93 * 107 = | | 8) 100 * 100 - 7 * 7 = 9951 |
| 9) | 294 * 306 = | | 9) 300 * 300 - 6 * 6 = 89964 |
| 10) | 103 * 97 = | | 10) 100 * 100 - 3 * 3 = 9991 |
| 11) | 71 * 269 - 71 * 69 = | | 11) ( 269 - 69) * 71 = 14200 |
| 12) | 32 * 52 + 32 * 48 = | | 12) ( 48 + 52) * 32 = 3200 |
| 13) | 76 * 175 - 76 * 75 = | | 13) ( 175 - 75) * 76 = 7600 |
| 14) | 64 * 39 + 61 * 64 = | | 14) ( 39 + 61) * 64 = 6400 |
| 15) | 24 * 138 + 62 * 24 = | | 15) ( 138 + 62) * 24 = 4800 |
| 16) | 72 * 256 - 72 * 56 = | | 16) ( 256 - 56) * 72 = 14400 |
| 17) | 137 * 54 + 63 * 54 = | | 17) ( 137 + 63) * 54 = 10800 |
| 18) | 40 * 62 + 40 * 38 = | | 18) ( 62 + 38) * 40 = 4000 |
| 19) | 25 * 155 + 25 * 45 = | | 19) ( 155 + 45) * 25 = 5000 |
| 20) | 93 * 172 - 72 * 93 = | | 20) ( 172 - 72) * 93 = 9300 |
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Score: ______________ | |
