Examples to find Least Common Multiple by using Prime Factorization Method

This topic would provide various examples on finding the least common multiple using the method of prime factorization.


Here are few examples illustrated on finding the least common multiple using the prime factorization method.

1. Find the least common multiple (L.C.M) of 105 and 124 by prime factorization method

Examples to find Least Common Multiple by using Prime Factorization Method

The factors of 105 = 5 × 3 × 7 

The factors of 124 = 2 × 2 × 31 = 22 × 31

The prime factors are 2, 3, 5, 7 and 31

The highest power of 2 is 22

The highest power of 3 is 3

The highest power of 5 is 5

The highest power of 7 is 7

The highest power of 31 is 31

The least common multiple of 105 and 124 is 22  × 5 × 3 × 7 × 31 = 13020


2. Find the least common multiple (L.C.M) of 18 and 30 by prime factorization method

Examples to find Least Common Multiple by using Prime Factorization Method

The factors of 18 are: 2 × 3 × 3 = 2 × 32

The factors of 30 are: 2 × 3 × 5 

The prime factors are 2, 3, and 5

The highest power of 2 is 2

The highest power of 3 is 32

The highest power of 5 is 5

The least common multiple of 18 and 30 is 2 × 32 × 5 = 2 × 3 × 3 × 5 = 90


3. Find the least common multiple (L.C.M) of 180 and 220 by prime factorization method

Examples to find Least Common Multiple by using Prime Factorization Method

The factors of 180 are: 2 × 2 × 3 × 3 × 5 = 22 × 32 × 5

The factors of 220 are: 2 × 2 × 5 × 11 =  22 × 5 × 11

The prime factors are 2, 3, and 5

The highest power of 2 is 22

The highest power of 3 is 32

The highest power of 5 is 5

The highest power of 11 is 11


The least common multiple of 180 and 220 is 22 × 32 ×5 × 11= 2 × 2 × 3 × 3 × 5 × 11 = 1980


4. Find the least common multiple (L.C.M) of 360 and 520 by prime factorization method:

Examples to find Least Common Multiple by using Prime Factorization Method

The factors of 360 are: 2 × 2 × 2 × 3 × 3 × 5 = 23 × 32 × 5

The factors of 520 are: 2 × 2 × 2 × 5 × 13 =  23 × 5 × 13

The prime factors are 2, 3, 5 and 13

The highest power of 2 is 23

The highest power of 3 is 32

The highest power of 5 is 5

The highest power of 13 is 13

The least common multiple of 360 and 520 is 23 × 32 × 5 × 13 = 2 × 2 × 2 × 3 × 3 × 5 × 13 = 4680


5. Find the least common multiple (L.C.M) of 44 and 88 by prime factorization method:

Examples to find Least Common Multiple by using Prime Factorization Method

The factors of 44 are: 2 × 2 × 11 = 22 × 11

The factors of 88 are: 2 × 2 × 2 × 11 = 23 × 11

The prime factors are 2 and 11

The highest power of 2 is 23

The highest power of 11 is 11

The least common multiple of 44 and 88 is 23 × 11 = 2 × 2 × 2 × 11 = 88.

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