It is only 1 because they are all prime numbers
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Three and five divide evenly into 15 and all the multiples of 15, which are infinite (15, 30, 45, 60, 75, 90, 105, 120, 135, 150 +15 . . . .)
The number is 1.
2 x 3 x 3 x 7 = 126 2 x 2 x 3 x 7 x 7 = 588 2 x 3 x 7 = 42 42 is the largest (greatest) number that can go into both (common) numbers equally.
1, 3, 7, 21.
48
To find what the factors of a number are you can list the factor pairs: 1 x 21 3 x 7 The factors of 21 are 1, 3, 7, and 21.