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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Wednesday January 21 2026
09:24:59 PM | Wednesday January 21 2026
09:24:59 PMFlip Answers |
| 1) | 206 * 194 = | | 1) 200 * 200 - 6 * 6 = 39964 |
| 2) | 101 * 99 = | | 2) 100 * 100 - 1 * 1 = 9999 |
| 3) | 393 * 407 = | | 3) 400 * 400 - 7 * 7 = 159951 |
| 4) | 110 * 90 = | | 4) 100 * 100 - 10 * 10 = 9900 |
| 5) | 97 * 103 = | | 5) 100 * 100 - 3 * 3 = 9991 |
| 6) | 305 * 295 = | | 6) 300 * 300 - 5 * 5 = 89975 |
| 7) | 401 * 399 = | | 7) 400 * 400 - 1 * 1 = 159999 |
| 8) | 193 * 207 = | | 8) 200 * 200 - 7 * 7 = 39951 |
| 9) | 394 * 406 = | | 9) 400 * 400 - 6 * 6 = 159964 |
| 10) | 104 * 96 = | | 10) 100 * 100 - 4 * 4 = 9984 |
| 11) | 73 * 72 + 128 * 73 = | | 11) ( 128 + 72) * 73 = 14600 |
| 12) | 26 * 165 + 35 * 26 = | | 12) ( 165 + 35) * 26 = 5200 |
| 13) | 259 * 34 - 34 * 59 = | | 13) ( 259 - 59) * 34 = 6800 |
| 14) | 48 * 247 - 47 * 48 = | | 14) ( 247 - 47) * 48 = 9600 |
| 15) | 54 * 47 + 54 * 53 = | | 15) ( 47 + 53) * 54 = 5400 |
| 16) | 154 * 72 - 54 * 72 = | | 16) ( 154 - 54) * 72 = 7200 |
| 17) | 76 * 274 - 74 * 76 = | | 17) ( 274 - 74) * 76 = 15200 |
| 18) | 150 * 59 - 59 * 50 = | | 18) ( 150 - 50) * 59 = 5900 |
| 19) | 29 * 60 + 40 * 29 = | | 19) ( 60 + 40) * 29 = 2900 |
| 20) | 54 * 55 + 146 * 55 = | | 20) ( 146 + 54) * 55 = 11000 |
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Score: ______________ | |
