# What is the LCM and the GCF of 20 30 and 15?

The least common multiple of 20-30-15 = 60

The smallest positive integer that is divisible by both numbers.

Other names include,

Lowest common multiple =60

Smallest common multiple = 60

The greatest common factor of 20-30-15 = 5

The Greatest Common Factor is the largest positive integer that will divide into the numbers with zero remainders.

Other names include,

The Greatest Common Divisor (GCD) 20-30-15 = 60

Highest Common Factor (HCF) 20-30-15 = 5

I use a factor tree and a chart in order to find the LCM and the GCF.

For the (GCF) find factors that you have pairs of the factors.

If you have multiple factors, multiply them together.

If you don't have pairs the (GCF) is 1.

If you have 3 numbers, for the LCM bring down only 1 number if you have two or three numbers in a column, and you must have three numbers in the column for the GCF.

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