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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Tuesday December 02 2025
07:45:36 PM | Tuesday December 02 2025
07:45:36 PMFlip Answers |
| 1) | 194 * 206 = | | 1) 200 * 200 - 6 * 6 = 39964 |
| 2) | 203 * 197 = | | 2) 200 * 200 - 3 * 3 = 39991 |
| 3) | 390 * 410 = | | 3) 400 * 400 - 10 * 10 = 159900 |
| 4) | 105 * 95 = | | 4) 100 * 100 - 5 * 5 = 9975 |
| 5) | 404 * 396 = | | 5) 400 * 400 - 4 * 4 = 159984 |
| 6) | 403 * 397 = | | 6) 400 * 400 - 3 * 3 = 159991 |
| 7) | 302 * 298 = | | 7) 300 * 300 - 2 * 2 = 89996 |
| 8) | 106 * 94 = | | 8) 100 * 100 - 6 * 6 = 9964 |
| 9) | 195 * 205 = | | 9) 200 * 200 - 5 * 5 = 39975 |
| 10) | 202 * 198 = | | 10) 200 * 200 - 2 * 2 = 39996 |
| 11) | 48 * 153 - 53 * 48 = | | 11) ( 153 - 53) * 48 = 4800 |
| 12) | 38 * 256 - 56 * 38 = | | 12) ( 256 - 56) * 38 = 7600 |
| 13) | 57 * 89 + 89 * 143 = | | 13) ( 143 + 57) * 89 = 17800 |
| 14) | 29 * 175 - 75 * 29 = | | 14) ( 175 - 75) * 29 = 2900 |
| 15) | 85 * 35 + 85 * 165 = | | 15) ( 165 + 35) * 85 = 17000 |
| 16) | 50 * 52 + 48 * 50 = | | 16) ( 48 + 52) * 50 = 5000 |
| 17) | 70 * 84 + 30 * 84 = | | 17) ( 30 + 70) * 84 = 8400 |
| 18) | 41 * 59 + 159 * 59 = | | 18) ( 159 + 41) * 59 = 11800 |
| 19) | 69 * 51 + 51 * 31 = | | 19) ( 31 + 69) * 51 = 5100 |
| 20) | 79 * 41 + 159 * 79 = | | 20) ( 159 + 41) * 79 = 15800 |
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Score: ______________ | |
