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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Wednesday October 21 2026
01:58:49 AM | Wednesday October 21 2026
01:58:49 AMFlip Answers |
| 1) | 398 * 402 = | | 1) 400 * 400 - 2 * 2 = 159996 |
| 2) | 309 * 291 = | | 2) 300 * 300 - 9 * 9 = 89919 |
| 3) | 295 * 305 = | | 3) 300 * 300 - 5 * 5 = 89975 |
| 4) | 198 * 202 = | | 4) 200 * 200 - 2 * 2 = 39996 |
| 5) | 404 * 396 = | | 5) 400 * 400 - 4 * 4 = 159984 |
| 6) | 297 * 303 = | | 6) 300 * 300 - 3 * 3 = 89991 |
| 7) | 197 * 203 = | | 7) 200 * 200 - 3 * 3 = 39991 |
| 8) | 307 * 293 = | | 8) 300 * 300 - 7 * 7 = 89951 |
| 9) | 106 * 94 = | | 9) 100 * 100 - 6 * 6 = 9964 |
| 10) | 206 * 194 = | | 10) 200 * 200 - 6 * 6 = 39964 |
| 11) | 47 * 164 - 64 * 47 = | | 11) ( 164 - 64) * 47 = 4700 |
| 12) | 64 * 90 + 136 * 90 = | | 12) ( 136 + 64) * 90 = 18000 |
| 13) | 92 * 43 + 57 * 92 = | | 13) ( 43 + 57) * 92 = 9200 |
| 14) | 140 * 74 - 74 * 40 = | | 14) ( 140 - 40) * 74 = 7400 |
| 15) | 87 * 160 - 60 * 87 = | | 15) ( 160 - 60) * 87 = 8700 |
| 16) | 138 * 36 + 36 * 62 = | | 16) ( 138 + 62) * 36 = 7200 |
| 17) | 238 * 32 - 32 * 38 = | | 17) ( 238 - 38) * 32 = 6400 |
| 18) | 73 * 84 + 27 * 84 = | | 18) ( 27 + 73) * 84 = 8400 |
| 19) | 43 * 157 - 43 * 57 = | | 19) ( 157 - 57) * 43 = 4300 |
| 20) | 30 * 27 + 73 * 30 = | | 20) ( 27 + 73) * 30 = 3000 |
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Score: ______________ | |
