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4 is the greatest common factor.
The least common multiplier (least common factor) of 8 and 20 is 40.
To solve for this you need to find the prime factors of each number
8 is 2x2x2
20 is 2x2x5
then count how many times each number is used in each set
8 has 3 twos
20 has 2 twos and 1 five
if the same number is used in both numbers throw out the repeat numbers from the smaller set
8 has more twos than 20 does, throw out the 2 twos
multiple all remaining numbers together
2x2x2x5=40
Check your work by dividing each number into your result, both should divide into it evenly
40/8=5
40/20=2
40 is the lowest number that both the 8 and the 20 will go into evenly.
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What is the least common multiple of 8 and 20 and 48?
The Least Common Multiple (LCM) for 8 20 48 is 240.
What is the lowest common factor of 12 and 8?
The least common factor of any set of numbers is 1.
What is the gcf for 20 and 8?
The greatest common factor of the numbers 8 and 20 is 4.
Is 16 the least common multiple of 4 and 8?
The least common multiple of two numbers is the product of the two numbers divided by their greatest common factor. The greatest common factor of 4 and 8 is 8. (See related question "What is the greatest common factor of 4 and 8?" for this calculation.) So, the least common multiple is 4 x 8 ÷ 4 = 8. Common multiples of 4 and 8 include 8, 16, 24, 32, 40, 48, 56, 64, 72, 80, etc. Although 16 is a common multiple, it is not the least common multiple.
What is the least common factor of 8 and 9?
The least common factor is a term often mistakenly given to either the greatest common factor (GCF) or the least common multiple (LCM). This term is not often used because it does not describe a useful relationship between numbers. Since 1 evenly divides all integers, 1 is technically the least common factor for any set of integers.8 and 9 are relatively prime, which means that they share no factors aside from 1.
