Only the number 1.
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An infinite number of of multiples of 42 can be divided by 42.
63 - 21 = 42
The factors of 42 are: 1, 2, 3, 6, 7, 14, 21, 42 The factors of 63 are: 1, 3, 7, 9, 21, 63
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.
The greatest common factor (GCF) of 42 and 63 is 21.To find the GCF (greatest common factor) of two numbers, first prime factorize them.42 = 2*3*763 = 3*3*7The GCF must be able to contain factors such that if divided by 42 or 63, the answer will be an integer.The GCF is 21.21