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 November 28 2025
08:34:46 AM | Friday November 28 2025
08:34:46 AMFlip Answers |
| 1) | 94 * 106 = | | 1) 100 * 100 - 6 * 6 = 9964 |
| 2) | 96 * 104 = | | 2) 100 * 100 - 4 * 4 = 9984 |
| 3) | 392 * 408 = | | 3) 400 * 400 - 8 * 8 = 159936 |
| 4) | 209 * 191 = | | 4) 200 * 200 - 9 * 9 = 39919 |
| 5) | 393 * 407 = | | 5) 400 * 400 - 7 * 7 = 159951 |
| 6) | 397 * 403 = | | 6) 400 * 400 - 3 * 3 = 159991 |
| 7) | 190 * 210 = | | 7) 200 * 200 - 10 * 10 = 39900 |
| 8) | 296 * 304 = | | 8) 300 * 300 - 4 * 4 = 89984 |
| 9) | 107 * 93 = | | 9) 100 * 100 - 7 * 7 = 9951 |
| 10) | 399 * 401 = | | 10) 400 * 400 - 1 * 1 = 159999 |
| 11) | 85 * 269 - 85 * 69 = | | 11) ( 269 - 69) * 85 = 17000 |
| 12) | 58 * 165 + 35 * 58 = | | 12) ( 165 + 35) * 58 = 11600 |
| 13) | 25 * 27 + 25 * 73 = | | 13) ( 27 + 73) * 25 = 2500 |
| 14) | 48 * 135 + 65 * 48 = | | 14) ( 135 + 65) * 48 = 9600 |
| 15) | 161 * 31 + 31 * 39 = | | 15) ( 161 + 39) * 31 = 6200 |
| 16) | 63 * 174 - 74 * 63 = | | 16) ( 174 - 74) * 63 = 6300 |
| 17) | 91 * 70 + 91 * 130 = | | 17) ( 130 + 70) * 91 = 18200 |
| 18) | 82 * 34 + 66 * 82 = | | 18) ( 34 + 66) * 82 = 8200 |
| 19) | 26 * 54 + 26 * 46 = | | 19) ( 46 + 54) * 26 = 2600 |
| 20) | 79 * 64 + 36 * 79 = | | 20) ( 36 + 64) * 79 = 7900 |
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Score: ______________ | |
