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The Greatest Common Divisor of 10, 45 is 5.
The Greatest Common Divisor (GCD) for 50 35 is 5.
The prime factors of 20 are 2, 2 and 5 The prime factors of 35 are 5 and 7 Therefore the greatest (and, other than 1, the only) common divisor of 20 and 35 is 5.
The Greatest Common Divisor (GCD) for 45 10 is 5
THe only common divisor of 35 and 60 is 5.