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| | Middle School Problems Archive (Site not responding. Last check: 2007-11-05) |
 | | The factors are 1, 3, 6, 14, 18, 21, 42, 63, and 126, and the Mystery Number is 126. |
 | | The number 1 is a factor of all numbers. |
 | | An easy way to find the other eight factors is to use the prime factorization of the number (2 × 3 × 3 × 7), which gives the factor 3. |
| www.nctm.org /middle/asolutions.asp?ID=385 (143 words) |
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