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 September 07 2026
05:17:37 PM | Monday September 07 2026
05:17:37 PMFlip Answers |
| 1) | 297 * 303 = | | 1) 300 * 300 - 3 * 3 = 89991 |
| 2) | 305 * 295 = | | 2) 300 * 300 - 5 * 5 = 89975 |
| 3) | 397 * 403 = | | 3) 400 * 400 - 3 * 3 = 159991 |
| 4) | 106 * 94 = | | 4) 100 * 100 - 6 * 6 = 9964 |
| 5) | 94 * 106 = | | 5) 100 * 100 - 6 * 6 = 9964 |
| 6) | 104 * 96 = | | 6) 100 * 100 - 4 * 4 = 9984 |
| 7) | 402 * 398 = | | 7) 400 * 400 - 2 * 2 = 159996 |
| 8) | 291 * 309 = | | 8) 300 * 300 - 9 * 9 = 89919 |
| 9) | 197 * 203 = | | 9) 200 * 200 - 3 * 3 = 39991 |
| 10) | 393 * 407 = | | 10) 400 * 400 - 7 * 7 = 159951 |
| 11) | 50 * 37 + 63 * 50 = | | 11) ( 63 + 37) * 50 = 5000 |
| 12) | 40 * 136 - 36 * 40 = | | 12) ( 136 - 36) * 40 = 4000 |
| 13) | 90 * 161 - 61 * 90 = | | 13) ( 161 - 61) * 90 = 9000 |
| 14) | 23 * 253 - 53 * 23 = | | 14) ( 253 - 53) * 23 = 4600 |
| 15) | 160 * 83 - 60 * 83 = | | 15) ( 160 - 60) * 83 = 8300 |
| 16) | 81 * 75 + 125 * 81 = | | 16) ( 125 + 75) * 81 = 16200 |
| 17) | 153 * 96 + 47 * 96 = | | 17) ( 153 + 47) * 96 = 19200 |
| 18) | 35 * 42 + 35 * 58 = | | 18) ( 58 + 42) * 35 = 3500 |
| 19) | 167 * 71 - 71 * 67 = | | 19) ( 167 - 67) * 71 = 7100 |
| 20) | 43 * 66 + 66 * 157 = | | 20) ( 157 + 43) * 66 = 13200 |
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Score: ______________ | |
