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 February 09 2026
09:19:07 AM | Monday February 09 2026
09:19:07 AMFlip Answers |
| 1) | 392 * 408 = | | 1) 400 * 400 - 8 * 8 = 159936 |
| 2) | 299 * 301 = | | 2) 300 * 300 - 1 * 1 = 89999 |
| 3) | 392 * 408 = | | 3) 400 * 400 - 8 * 8 = 159936 |
| 4) | 403 * 397 = | | 4) 400 * 400 - 3 * 3 = 159991 |
| 5) | 198 * 202 = | | 5) 200 * 200 - 2 * 2 = 39996 |
| 6) | 193 * 207 = | | 6) 200 * 200 - 7 * 7 = 39951 |
| 7) | 299 * 301 = | | 7) 300 * 300 - 1 * 1 = 89999 |
| 8) | 407 * 393 = | | 8) 400 * 400 - 7 * 7 = 159951 |
| 9) | 406 * 394 = | | 9) 400 * 400 - 6 * 6 = 159964 |
| 10) | 399 * 401 = | | 10) 400 * 400 - 1 * 1 = 159999 |
| 11) | 59 * 64 + 64 * 141 = | | 11) ( 141 + 59) * 64 = 12800 |
| 12) | 164 * 94 - 64 * 94 = | | 12) ( 164 - 64) * 94 = 9400 |
| 13) | 38 * 38 + 38 * 62 = | | 13) ( 38 + 62) * 38 = 3800 |
| 14) | 263 * 69 - 69 * 63 = | | 14) ( 263 - 63) * 69 = 13800 |
| 15) | 23 * 247 - 23 * 47 = | | 15) ( 247 - 47) * 23 = 4600 |
| 16) | 72 * 136 - 72 * 36 = | | 16) ( 136 - 36) * 72 = 7200 |
| 17) | 157 * 30 + 43 * 30 = | | 17) ( 157 + 43) * 30 = 6000 |
| 18) | 53 * 273 - 73 * 53 = | | 18) ( 273 - 73) * 53 = 10600 |
| 19) | 161 * 64 + 64 * 39 = | | 19) ( 161 + 39) * 64 = 12800 |
| 20) | 48 * 71 + 71 * 52 = | | 20) ( 48 + 52) * 71 = 7100 |
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Score: ______________ | |
