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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Monday December 22 2025
06:47:24 AM | Monday December 22 2025
06:47:24 AMFlip Answers |
| 1) | 92 * 108 = | | 1) 100 * 100 - 8 * 8 = 9936 |
| 2) | 398 * 402 = | | 2) 400 * 400 - 2 * 2 = 159996 |
| 3) | 295 * 305 = | | 3) 300 * 300 - 5 * 5 = 89975 |
| 4) | 294 * 306 = | | 4) 300 * 300 - 6 * 6 = 89964 |
| 5) | 399 * 401 = | | 5) 400 * 400 - 1 * 1 = 159999 |
| 6) | 209 * 191 = | | 6) 200 * 200 - 9 * 9 = 39919 |
| 7) | 403 * 397 = | | 7) 400 * 400 - 3 * 3 = 159991 |
| 8) | 206 * 194 = | | 8) 200 * 200 - 6 * 6 = 39964 |
| 9) | 198 * 202 = | | 9) 200 * 200 - 2 * 2 = 39996 |
| 10) | 298 * 302 = | | 10) 300 * 300 - 2 * 2 = 89996 |
| 11) | 41 * 25 + 59 * 25 = | | 11) ( 41 + 59) * 25 = 2500 |
| 12) | 36 * 60 + 64 * 60 = | | 12) ( 64 + 36) * 60 = 6000 |
| 13) | 147 * 41 + 53 * 41 = | | 13) ( 147 + 53) * 41 = 8200 |
| 14) | 71 * 22 + 29 * 22 = | | 14) ( 29 + 71) * 22 = 2200 |
| 15) | 273 * 89 - 89 * 73 = | | 15) ( 273 - 73) * 89 = 17800 |
| 16) | 71 * 240 - 40 * 71 = | | 16) ( 240 - 40) * 71 = 14200 |
| 17) | 259 * 35 - 59 * 35 = | | 17) ( 259 - 59) * 35 = 7000 |
| 18) | 54 * 57 + 54 * 143 = | | 18) ( 143 + 57) * 54 = 10800 |
| 19) | 39 * 47 + 161 * 47 = | | 19) ( 161 + 39) * 47 = 9400 |
| 20) | 66 * 76 + 34 * 76 = | | 20) ( 34 + 66) * 76 = 7600 |
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Score: ______________ | |
