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 February 11 2026
08:13:31 AM | Wednesday February 11 2026
08:13:31 AMFlip Answers |
| 1) | 192 * 208 = | | 1) 200 * 200 - 8 * 8 = 39936 |
| 2) | 298 * 302 = | | 2) 300 * 300 - 2 * 2 = 89996 |
| 3) | 398 * 402 = | | 3) 400 * 400 - 2 * 2 = 159996 |
| 4) | 202 * 198 = | | 4) 200 * 200 - 2 * 2 = 39996 |
| 5) | 193 * 207 = | | 5) 200 * 200 - 7 * 7 = 39951 |
| 6) | 201 * 199 = | | 6) 200 * 200 - 1 * 1 = 39999 |
| 7) | 194 * 206 = | | 7) 200 * 200 - 6 * 6 = 39964 |
| 8) | 110 * 90 = | | 8) 100 * 100 - 10 * 10 = 9900 |
| 9) | 206 * 194 = | | 9) 200 * 200 - 6 * 6 = 39964 |
| 10) | 110 * 90 = | | 10) 100 * 100 - 10 * 10 = 9900 |
| 11) | 21 * 27 + 21 * 73 = | | 11) ( 27 + 73) * 21 = 2100 |
| 12) | 73 * 66 + 66 * 27 = | | 12) ( 27 + 73) * 66 = 6600 |
| 13) | 94 * 250 - 50 * 94 = | | 13) ( 250 - 50) * 94 = 18800 |
| 14) | 67 * 64 + 67 * 136 = | | 14) ( 136 + 64) * 67 = 13400 |
| 15) | 260 * 30 - 60 * 30 = | | 15) ( 260 - 60) * 30 = 6000 |
| 16) | 173 * 90 - 90 * 73 = | | 16) ( 173 - 73) * 90 = 9000 |
| 17) | 46 * 93 + 154 * 93 = | | 17) ( 154 + 46) * 93 = 18600 |
| 18) | 147 * 42 - 47 * 42 = | | 18) ( 147 - 47) * 42 = 4200 |
| 19) | 23 * 28 + 23 * 72 = | | 19) ( 28 + 72) * 23 = 2300 |
| 20) | 160 * 68 - 68 * 60 = | | 20) ( 160 - 60) * 68 = 6800 |
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Score: ______________ | |
