Factor pairs are just the factors of a number listed in a different way.
The factors of 20 are 1, 2, 4, 5, 10, 20
The factor pairs of 20 are (20,1)(10,2)(5,4)
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You find a factor pair take the number that you want to find the factor pair of and divide it by a number. If the answer come out evenly then that's your factor pair EX. Factor pairs of 150 1 and 150 2 and 75 3 and 50 5 and 30 6 and 25 10 and 15
The number 18.
12 and 18 have three factor pairs.
To find factor pairs of a number, you divide that number by each integer in turn. If the number divides evenly, you take that divisor, and its answer, as a factor pair. 36 can divide by 1, 2, 3, 4, 6, 9, 12, 18 and 36. Thus the factor pairs are 1 and 36, 2 and 18, 3 and 12, 4 and 9, and 6 and 6.
For every factor of a number, there is another factor that results when you divide the first factor into the number. Factors can be listed in pairs. Since 9 x 4 = 36, (9,4) is a factor pair of 36.