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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Saturday December 13 2025
01:54:25 AM | Saturday December 13 2025
01:54:25 AMFlip Answers |
| 1) | 301 * 299 = | | 1) 300 * 300 - 1 * 1 = 89999 |
| 2) | 190 * 210 = | | 2) 200 * 200 - 10 * 10 = 39900 |
| 3) | 98 * 102 = | | 3) 100 * 100 - 2 * 2 = 9996 |
| 4) | 290 * 310 = | | 4) 300 * 300 - 10 * 10 = 89900 |
| 5) | 295 * 305 = | | 5) 300 * 300 - 5 * 5 = 89975 |
| 6) | 192 * 208 = | | 6) 200 * 200 - 8 * 8 = 39936 |
| 7) | 196 * 204 = | | 7) 200 * 200 - 4 * 4 = 39984 |
| 8) | 309 * 291 = | | 8) 300 * 300 - 9 * 9 = 89919 |
| 9) | 97 * 103 = | | 9) 100 * 100 - 3 * 3 = 9991 |
| 10) | 293 * 307 = | | 10) 300 * 300 - 7 * 7 = 89951 |
| 11) | 46 * 37 + 54 * 37 = | | 11) ( 46 + 54) * 37 = 3700 |
| 12) | 38 * 57 + 43 * 38 = | | 12) ( 43 + 57) * 38 = 3800 |
| 13) | 58 * 245 - 45 * 58 = | | 13) ( 245 - 45) * 58 = 11600 |
| 14) | 85 * 43 + 85 * 57 = | | 14) ( 43 + 57) * 85 = 8500 |
| 15) | 56 * 243 - 43 * 56 = | | 15) ( 243 - 43) * 56 = 11200 |
| 16) | 77 * 62 + 138 * 77 = | | 16) ( 138 + 62) * 77 = 15400 |
| 17) | 91 * 57 + 143 * 91 = | | 17) ( 143 + 57) * 91 = 18200 |
| 18) | 29 * 65 + 35 * 29 = | | 18) ( 65 + 35) * 29 = 2900 |
| 19) | 48 * 240 - 48 * 40 = | | 19) ( 240 - 40) * 48 = 9600 |
| 20) | 67 * 256 - 67 * 56 = | | 20) ( 256 - 56) * 67 = 13400 |
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Score: ______________ | |
