GCF(40, 100) = 20
GCD is equal to the product of the common prime factors on the left side of the cake above.
GCF(40, 100) = 2 . 2 . 5 = 20
The common factors of 40 and 100 are 1, 2, 4, 5, 10 and 20. Among these numbers, the greatest one is 20
The greatest common factor (GCF) of two positive whole numbers is the largest number that divides these numbers exactly. GCF can be found by using the upside-down cake method. It is equal to the product of the common prime factors listed on the left.