The factors of a number are the numbers that divide it evenly. The factors of \(9\) are \(1,3,\) and \(9\) because they all divide \(9.\) The number \(5\) is not a factor of \(9\) because when \(5\) divides into \(9\) it leaves a remainder of \(4.\)
Example Find all the factors of \(12.\)
Solution \(\downarrow\)
The numbers from \(1\) to \(12\) are \(1,2,3,4,5,6,7,8,9,10,11,12.\) We need to check which of those divide \(12.\)
\(12 / 1 = 12\)
\(12 / 2 = 6\)
\(12 / 3 = 4\)
\(12 / 4 = 3\)
\(12 / 5 = 2 r 2\)
\(12 / 6 = 2\)
\(12 / 7 = 1 r 5\)
\(12 / 8 = 1 r 4\)
\(12 / 9 = 1 r 3\)
\(12 / 10 = 1 r 2\)
\(12 / 11 = 1 r 1\)
\(12 / 12 = 1\)
The numbers that divide evenly into \(12\) are \(1,2,3,4,6,\) and \(12.\) Those are the factors of \(12.\)
Write the factors of this number separated by commas.