LCM of 7 and 12 and GCF of 7 and 12

Tuesday, November 10, 2020

What is the LCM and GCF of 7 and 12?


The least common multiple of 7 and 12 = 84

The smallest positive integer that is divisible by both numbers.

Other names include,

Lowest common multiple =84

Smallest common multiple = 84


The greatest common factor of 7 and 12 = 1

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

Other names include,

The Greatest Common Divisor (GCD) 7 and 12 = 1

Highest Common Factor (HCF) 7 and 12 = 1


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


lcm 7 and 12


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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