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**GCF or greatest common factor**is the largest positive integer that will divide into each number evenly or in other words a remainder of zero

For example, the greatest common factor of 77 and 91 would be 143.

There are several different names for the GCF ( greatest common factor)

GCD Greatest Common Denominator

HCF Highest Common Factor

GCD Greatest Common Divisor

**The GCF for 77, 91 and 143 equals 1001**

The lcm or least common multiple is the smallest positive integer that two or more numbers will divide into evenly. Again, a zero remainder.

Other names for the LCM

LCD Least Common Denominator

LCD Least Common Divisor

**The LCM of 77, 91 and 143 equals 1**

I like to use a factor tree to find the LCM and the GCF

Once you find all of the prime factors of a number, to find the GCF you multiply all of the factors, but multiply duplicates in each number only once.

In order to calculate the LCM, you look for prime factors in each number.

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