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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Friday February 20 2026
10:15:25 PM | Friday February 20 2026
10:15:25 PMFlip Answers |
| 1) | 206 * 194 = | | 1) 200 * 200 - 6 * 6 = 39964 |
| 2) | 402 * 398 = | | 2) 400 * 400 - 2 * 2 = 159996 |
| 3) | 403 * 397 = | | 3) 400 * 400 - 3 * 3 = 159991 |
| 4) | 399 * 401 = | | 4) 400 * 400 - 1 * 1 = 159999 |
| 5) | 102 * 98 = | | 5) 100 * 100 - 2 * 2 = 9996 |
| 6) | 396 * 404 = | | 6) 400 * 400 - 4 * 4 = 159984 |
| 7) | 395 * 405 = | | 7) 400 * 400 - 5 * 5 = 159975 |
| 8) | 407 * 393 = | | 8) 400 * 400 - 7 * 7 = 159951 |
| 9) | 395 * 405 = | | 9) 400 * 400 - 5 * 5 = 159975 |
| 10) | 107 * 93 = | | 10) 100 * 100 - 7 * 7 = 9951 |
| 11) | 143 * 50 + 57 * 50 = | | 11) ( 143 + 57) * 50 = 10000 |
| 12) | 73 * 86 + 27 * 86 = | | 12) ( 27 + 73) * 86 = 8600 |
| 13) | 162 * 65 - 65 * 62 = | | 13) ( 162 - 62) * 65 = 6500 |
| 14) | 30 * 67 + 70 * 67 = | | 14) ( 30 + 70) * 67 = 6700 |
| 15) | 48 * 33 + 52 * 33 = | | 15) ( 52 + 48) * 33 = 3300 |
| 16) | 166 * 78 - 78 * 66 = | | 16) ( 166 - 66) * 78 = 7800 |
| 17) | 270 * 67 - 67 * 70 = | | 17) ( 270 - 70) * 67 = 13400 |
| 18) | 275 * 36 - 75 * 36 = | | 18) ( 275 - 75) * 36 = 7200 |
| 19) | 37 * 59 + 59 * 163 = | | 19) ( 163 + 37) * 59 = 11800 |
| 20) | 235 * 70 - 35 * 70 = | | 20) ( 235 - 35) * 70 = 14000 |
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Score: ______________ | |
