What is the GCF of 20 and 30?
GCF or the Greatest Common Factor is the largest possible number which can divide the numbers perfectly i.e. leaving zero as the remainder.
Answer: GCF of 20 and 30 = 10
Two methods to find the GCF of 20 and 30 are explained below.
Methods to find GCF of 20 and 30
- GCF of 2 and 6 by Listing Factors
- GCF of 2 and 6 by Step Division
Method1: Listing Factors to Find the GCF of 20 and 30
Here we take the two given number, 20 and 30 and write their factors.
We the encircle all the common factors and then spot the one which is the largest in value and that is the GCF.
Common Factors of 20 and 30: 1, 2, 5 and 10
Greatest amongst the common factors: 10
Method2: Step Division to Find the GCF of 20 and 30
Here we take the larger number as the dividend and the smaller number as the divisor to perform the division.
In the next step remainder acts as the dividor and the previous dividor as the dividend. This continues untill a 0 is obtained as the remainder.
GCF (20,30) is 10