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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Friday June 19 2026
05:55:13 AM | Friday June 19 2026
05:55:13 AMFlip Answers |
| 1) | 204 * 196 = | | 1) 200 * 200 - 4 * 4 = 39984 |
| 2) | 408 * 392 = | | 2) 400 * 400 - 8 * 8 = 159936 |
| 3) | 94 * 106 = | | 3) 100 * 100 - 6 * 6 = 9964 |
| 4) | 398 * 402 = | | 4) 400 * 400 - 2 * 2 = 159996 |
| 5) | 406 * 394 = | | 5) 400 * 400 - 6 * 6 = 159964 |
| 6) | 202 * 198 = | | 6) 200 * 200 - 2 * 2 = 39996 |
| 7) | 295 * 305 = | | 7) 300 * 300 - 5 * 5 = 89975 |
| 8) | 395 * 405 = | | 8) 400 * 400 - 5 * 5 = 159975 |
| 9) | 393 * 407 = | | 9) 400 * 400 - 7 * 7 = 159951 |
| 10) | 210 * 190 = | | 10) 200 * 200 - 10 * 10 = 39900 |
| 11) | 173 * 22 - 22 * 73 = | | 11) ( 173 - 73) * 22 = 2200 |
| 12) | 25 * 145 + 55 * 25 = | | 12) ( 145 + 55) * 25 = 5000 |
| 13) | 28 * 52 + 48 * 28 = | | 13) ( 48 + 52) * 28 = 2800 |
| 14) | 151 * 77 - 77 * 51 = | | 14) ( 151 - 51) * 77 = 7700 |
| 15) | 36 * 44 + 64 * 44 = | | 15) ( 64 + 36) * 44 = 4400 |
| 16) | 45 * 56 + 44 * 45 = | | 16) ( 56 + 44) * 45 = 4500 |
| 17) | 69 * 83 + 83 * 131 = | | 17) ( 131 + 69) * 83 = 16600 |
| 18) | 138 * 21 + 62 * 21 = | | 18) ( 138 + 62) * 21 = 4200 |
| 19) | 255 * 82 - 55 * 82 = | | 19) ( 255 - 55) * 82 = 16400 |
| 20) | 30 * 274 - 74 * 30 = | | 20) ( 274 - 74) * 30 = 6000 |
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Score: ______________ | |
