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 May 09 2026
02:47:35 PM | Saturday May 09 2026
02:47:35 PMFlip Answers |
| 1) | 206 * 194 = | | 1) 200 * 200 - 6 * 6 = 39964 |
| 2) | 401 * 399 = | | 2) 400 * 400 - 1 * 1 = 159999 |
| 3) | 194 * 206 = | | 3) 200 * 200 - 6 * 6 = 39964 |
| 4) | 209 * 191 = | | 4) 200 * 200 - 9 * 9 = 39919 |
| 5) | 303 * 297 = | | 5) 300 * 300 - 3 * 3 = 89991 |
| 6) | 408 * 392 = | | 6) 400 * 400 - 8 * 8 = 159936 |
| 7) | 192 * 208 = | | 7) 200 * 200 - 8 * 8 = 39936 |
| 8) | 194 * 206 = | | 8) 200 * 200 - 6 * 6 = 39964 |
| 9) | 305 * 295 = | | 9) 300 * 300 - 5 * 5 = 89975 |
| 10) | 391 * 409 = | | 10) 400 * 400 - 9 * 9 = 159919 |
| 11) | 91 * 126 + 74 * 91 = | | 11) ( 126 + 74) * 91 = 18200 |
| 12) | 62 * 51 + 62 * 149 = | | 12) ( 149 + 51) * 62 = 12400 |
| 13) | 45 * 47 + 153 * 45 = | | 13) ( 153 + 47) * 45 = 9000 |
| 14) | 54 * 145 - 45 * 54 = | | 14) ( 145 - 45) * 54 = 5400 |
| 15) | 45 * 74 + 55 * 74 = | | 15) ( 55 + 45) * 74 = 7400 |
| 16) | 39 * 240 - 39 * 40 = | | 16) ( 240 - 40) * 39 = 7800 |
| 17) | 150 * 24 - 24 * 50 = | | 17) ( 150 - 50) * 24 = 2400 |
| 18) | 46 * 76 + 54 * 76 = | | 18) ( 46 + 54) * 76 = 7600 |
| 19) | 48 * 52 + 152 * 52 = | | 19) ( 152 + 48) * 52 = 10400 |
| 20) | 245 * 39 - 39 * 45 = | | 20) ( 245 - 45) * 39 = 7800 |
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Score: ______________ | |
