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What is the greatest common factor of 48 and 120?

A 24

The greatest common factor (GCF) is also called greatest common divisor, or highest common factor. For 2 or more numbers, the largest positive number that divides the given numbers without remainder is the GCF.
For 120 and 48, number 24 is the GCF. That is, $3514_w62_h38.png$ and $6140_w53_h38.png$
No number higher than 24 can divide both numbers and come up with a positive whole number.