The rules of divisibility tell you that 63 is divisible by 1 (because all integers are), 3 (because its digits total a multiple of 3) and 9 (because its digits total a multiple of 9)
Dividing those numbers into 63 gives you the other three (63, 21 and 7)
(1, 3, 7, 9, 21, 63)
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The factors of 63 are 1, 3, 7, 9, 21 and 63. To find all the factors of a number start with 1 times the number and list the factor pairs. 63: 1 x 63 3 x 21 7 x 9
(63,1)(21,3)(9,7)
A factor is a divisor - a number that will evenly divide into another number. One way to determine the common factors and greatest common factor is to find all the factors of the numbers and compare them. The factors of 42 are 1, 2, 3, 6, 7, 14, 21, and 42. The factors of 63 are 1, 3, 7, 9, 21, and 63. The common factors are 1, 3, 7, and 21.
Since 21 is a factor of 63, all of its factors are common.
The factors of 63 are: 1, 3, 7, 9, 21, 63 The factors of 96 are: 1, 2, 3, 4, 6, 8, 12, 16, 24, 32, 48, 96 The common factors are: 1, 3