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
09:00:45 PM | Friday November 28 2025
09:00:45 PMFlip Answers |
| 1) | 292 * 308 = | | 1) 300 * 300 - 8 * 8 = 89936 |
| 2) | 309 * 291 = | | 2) 300 * 300 - 9 * 9 = 89919 |
| 3) | 207 * 193 = | | 3) 200 * 200 - 7 * 7 = 39951 |
| 4) | 103 * 97 = | | 4) 100 * 100 - 3 * 3 = 9991 |
| 5) | 92 * 108 = | | 5) 100 * 100 - 8 * 8 = 9936 |
| 6) | 308 * 292 = | | 6) 300 * 300 - 8 * 8 = 89936 |
| 7) | 209 * 191 = | | 7) 200 * 200 - 9 * 9 = 39919 |
| 8) | 405 * 395 = | | 8) 400 * 400 - 5 * 5 = 159975 |
| 9) | 190 * 210 = | | 9) 200 * 200 - 10 * 10 = 39900 |
| 10) | 301 * 299 = | | 10) 300 * 300 - 1 * 1 = 89999 |
| 11) | 85 * 147 + 85 * 53 = | | 11) ( 147 + 53) * 85 = 17000 |
| 12) | 82 * 170 - 70 * 82 = | | 12) ( 170 - 70) * 82 = 8200 |
| 13) | 94 * 266 - 94 * 66 = | | 13) ( 266 - 66) * 94 = 18800 |
| 14) | 41 * 50 + 41 * 150 = | | 14) ( 150 + 50) * 41 = 8200 |
| 15) | 56 * 266 - 66 * 56 = | | 15) ( 266 - 66) * 56 = 11200 |
| 16) | 47 * 43 + 53 * 43 = | | 16) ( 47 + 53) * 43 = 4300 |
| 17) | 46 * 158 - 58 * 46 = | | 17) ( 158 - 58) * 46 = 4600 |
| 18) | 35 * 247 - 35 * 47 = | | 18) ( 247 - 47) * 35 = 7000 |
| 19) | 96 * 43 + 96 * 57 = | | 19) ( 43 + 57) * 96 = 9600 |
| 20) | 64 * 59 + 64 * 141 = | | 20) ( 141 + 59) * 64 = 12800 |
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Score: ______________ | |
