1260
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It is: 756
21, 42, 63, 84, 105.
42 63 84 105 126 147
The GCF of 63, 84, and 105 = 21 The prime factorization of 63 = 3^2 x 7 The prime factorization of 84 = 2^2 x 3 x 7 The prime factorization of 105 = 3 x 5 x 7 The GCF is the product of the lowest power of the primes common to all number factorizations, so the gcf = 3 x 7 = 21
The first five multiples of 21 are: 21, 42, 63, 84, 105.