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 November 02 2026
10:17:23 AM | Monday November 02 2026
10:17:23 AMFlip Answers |
| 1) | 194 * 206 = | | 1) 200 * 200 - 6 * 6 = 39964 |
| 2) | 99 * 101 = | | 2) 100 * 100 - 1 * 1 = 9999 |
| 3) | 196 * 204 = | | 3) 200 * 200 - 4 * 4 = 39984 |
| 4) | 309 * 291 = | | 4) 300 * 300 - 9 * 9 = 89919 |
| 5) | 394 * 406 = | | 5) 400 * 400 - 6 * 6 = 159964 |
| 6) | 407 * 393 = | | 6) 400 * 400 - 7 * 7 = 159951 |
| 7) | 103 * 97 = | | 7) 100 * 100 - 3 * 3 = 9991 |
| 8) | 190 * 210 = | | 8) 200 * 200 - 10 * 10 = 39900 |
| 9) | 208 * 192 = | | 9) 200 * 200 - 8 * 8 = 39936 |
| 10) | 398 * 402 = | | 10) 400 * 400 - 2 * 2 = 159996 |
| 11) | 53 * 252 - 53 * 52 = | | 11) ( 252 - 52) * 53 = 10600 |
| 12) | 49 * 135 - 35 * 49 = | | 12) ( 135 - 35) * 49 = 4900 |
| 13) | 73 * 267 - 73 * 67 = | | 13) ( 267 - 67) * 73 = 14600 |
| 14) | 149 * 90 + 90 * 51 = | | 14) ( 149 + 51) * 90 = 18000 |
| 15) | 238 * 28 - 38 * 28 = | | 15) ( 238 - 38) * 28 = 5600 |
| 16) | 44 * 140 + 60 * 44 = | | 16) ( 140 + 60) * 44 = 8800 |
| 17) | 263 * 43 - 43 * 63 = | | 17) ( 263 - 63) * 43 = 8600 |
| 18) | 36 * 63 + 64 * 63 = | | 18) ( 64 + 36) * 63 = 6300 |
| 19) | 50 * 158 - 50 * 58 = | | 19) ( 158 - 58) * 50 = 5000 |
| 20) | 242 * 82 - 82 * 42 = | | 20) ( 242 - 42) * 82 = 16400 |
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Score: ______________ | |
