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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Saturday March 07 2026
10:24:41 AM | Saturday March 07 2026
10:24:41 AMFlip Answers |
| 1) | 210 * 190 = | | 1) 200 * 200 - 10 * 10 = 39900 |
| 2) | 192 * 208 = | | 2) 200 * 200 - 8 * 8 = 39936 |
| 3) | 397 * 403 = | | 3) 400 * 400 - 3 * 3 = 159991 |
| 4) | 95 * 105 = | | 4) 100 * 100 - 5 * 5 = 9975 |
| 5) | 97 * 103 = | | 5) 100 * 100 - 3 * 3 = 9991 |
| 6) | 196 * 204 = | | 6) 200 * 200 - 4 * 4 = 39984 |
| 7) | 406 * 394 = | | 7) 400 * 400 - 6 * 6 = 159964 |
| 8) | 308 * 292 = | | 8) 300 * 300 - 8 * 8 = 89936 |
| 9) | 395 * 405 = | | 9) 400 * 400 - 5 * 5 = 159975 |
| 10) | 302 * 298 = | | 10) 300 * 300 - 2 * 2 = 89996 |
| 11) | 125 * 21 + 75 * 21 = | | 11) ( 125 + 75) * 21 = 4200 |
| 12) | 91 * 165 - 65 * 91 = | | 12) ( 165 - 65) * 91 = 9100 |
| 13) | 52 * 271 - 71 * 52 = | | 13) ( 271 - 71) * 52 = 10400 |
| 14) | 57 * 88 + 88 * 143 = | | 14) ( 143 + 57) * 88 = 17600 |
| 15) | 46 * 52 + 46 * 48 = | | 15) ( 52 + 48) * 46 = 4600 |
| 16) | 44 * 41 + 44 * 159 = | | 16) ( 159 + 41) * 44 = 8800 |
| 17) | 250 * 34 - 34 * 50 = | | 17) ( 250 - 50) * 34 = 6800 |
| 18) | 252 * 79 - 52 * 79 = | | 18) ( 252 - 52) * 79 = 15800 |
| 19) | 75 * 60 + 75 * 40 = | | 19) ( 60 + 40) * 75 = 7500 |
| 20) | 82 * 67 + 82 * 133 = | | 20) ( 133 + 67) * 82 = 16400 |
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Score: ______________ | |
