Solutions by everydaycalculation.com
The GCF of 21 and 648 is 3.
MathStep (Works offline)
Download our mobile app and learn how to find GCF of upto four numbers in your own time:
Android and iPhone/ iPad
Find HCF of: 42 & 1296 63 & 1944 7 & 216 105 & 3240 147 & 4536 42 & 648 21 & 1296 63 & 648 21 & 1944 105 & 648 21 & 3240 147 & 648 21 & 4536
Enter two numbers separate by comma. To find GCF of more than two numbers, click here.
The greatest common factor (GCF) is also known as greatest common divisor (GCD) or highest common factor (HCF).
© everydaycalculation.com