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 March 23 2026
09:00:16 AM | Monday March 23 2026
09:00:16 AMFlip Answers |
| 1) | 402 * 398 = | | 1) 400 * 400 - 2 * 2 = 159996 |
| 2) | 99 * 101 = | | 2) 100 * 100 - 1 * 1 = 9999 |
| 3) | 193 * 207 = | | 3) 200 * 200 - 7 * 7 = 39951 |
| 4) | 94 * 106 = | | 4) 100 * 100 - 6 * 6 = 9964 |
| 5) | 398 * 402 = | | 5) 400 * 400 - 2 * 2 = 159996 |
| 6) | 399 * 401 = | | 6) 400 * 400 - 1 * 1 = 159999 |
| 7) | 290 * 310 = | | 7) 300 * 300 - 10 * 10 = 89900 |
| 8) | 393 * 407 = | | 8) 400 * 400 - 7 * 7 = 159951 |
| 9) | 395 * 405 = | | 9) 400 * 400 - 5 * 5 = 159975 |
| 10) | 394 * 406 = | | 10) 400 * 400 - 6 * 6 = 159964 |
| 11) | 164 * 41 + 36 * 41 = | | 11) ( 164 + 36) * 41 = 8200 |
| 12) | 238 * 62 - 62 * 38 = | | 12) ( 238 - 38) * 62 = 12400 |
| 13) | 41 * 273 - 41 * 73 = | | 13) ( 273 - 73) * 41 = 8200 |
| 14) | 71 * 44 + 156 * 71 = | | 14) ( 156 + 44) * 71 = 14200 |
| 15) | 84 * 163 + 84 * 37 = | | 15) ( 163 + 37) * 84 = 16800 |
| 16) | 44 * 25 + 156 * 25 = | | 16) ( 156 + 44) * 25 = 5000 |
| 17) | 245 * 38 - 45 * 38 = | | 17) ( 245 - 45) * 38 = 7600 |
| 18) | 39 * 26 + 161 * 26 = | | 18) ( 161 + 39) * 26 = 5200 |
| 19) | 250 * 93 - 93 * 50 = | | 19) ( 250 - 50) * 93 = 18600 |
| 20) | 79 * 171 - 71 * 79 = | | 20) ( 171 - 71) * 79 = 7900 |
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Score: ______________ | |
