What is the LCM and GCF of 42 and 56?

The least common multiple of 42 and 56 = 168

Other names include,

Lowest common multiple = 168

Smallest common multiple = 168

The greatest common factor of 42 and 56 = 14

Other names include,

The Greatest Common Divisor (GCD) 42 and 56 = 14

Highest Common Factor (HCF) 42 and 56 = 14

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

Once you have the prime factors for the LCM multiply all the factors together but if you have two of the same factor only use it once.

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