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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Saturday August 16 2025
01:24:01 AM | Saturday August 16 2025
01:24:01 AMFlip Answers |
| 1) | 195 * 205 = | | 1) 200 * 200 - 5 * 5 = 39975 |
| 2) | 190 * 210 = | | 2) 200 * 200 - 10 * 10 = 39900 |
| 3) | 293 * 307 = | | 3) 300 * 300 - 7 * 7 = 89951 |
| 4) | 196 * 204 = | | 4) 200 * 200 - 4 * 4 = 39984 |
| 5) | 197 * 203 = | | 5) 200 * 200 - 3 * 3 = 39991 |
| 6) | 201 * 199 = | | 6) 200 * 200 - 1 * 1 = 39999 |
| 7) | 391 * 409 = | | 7) 400 * 400 - 9 * 9 = 159919 |
| 8) | 406 * 394 = | | 8) 400 * 400 - 6 * 6 = 159964 |
| 9) | 194 * 206 = | | 9) 200 * 200 - 6 * 6 = 39964 |
| 10) | 90 * 110 = | | 10) 100 * 100 - 10 * 10 = 9900 |
| 11) | 46 * 262 - 46 * 62 = | | 11) ( 262 - 62) * 46 = 9200 |
| 12) | 161 * 56 + 39 * 56 = | | 12) ( 161 + 39) * 56 = 11200 |
| 13) | 43 * 65 + 43 * 35 = | | 13) ( 65 + 35) * 43 = 4300 |
| 14) | 264 * 81 - 81 * 64 = | | 14) ( 264 - 64) * 81 = 16200 |
| 15) | 73 * 165 - 73 * 65 = | | 15) ( 165 - 65) * 73 = 7300 |
| 16) | 272 * 48 - 72 * 48 = | | 16) ( 272 - 72) * 48 = 9600 |
| 17) | 137 * 62 - 62 * 37 = | | 17) ( 137 - 37) * 62 = 6200 |
| 18) | 53 * 54 + 54 * 47 = | | 18) ( 47 + 53) * 54 = 5400 |
| 19) | 266 * 94 - 66 * 94 = | | 19) ( 266 - 66) * 94 = 18800 |
| 20) | 140 * 55 - 55 * 40 = | | 20) ( 140 - 40) * 55 = 5500 |
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Score: ______________ | |
