That would be 1--no numbers besides 1 go into both 10 and 21.
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GCD: 21
The Greatest Common Divisor/Denominator is 21
The Greatest Common Divisor (GCD) for 45 10 is 5
Greatest Common Divisor (GCD) for 50 70 is 10.
Greatest Common Divisor (GCD) for 30 80 is 10.