LCM for 15 and 20
What's the Least Common Multiple (LCM) of 15 and 20?
(Sixty)
Finding LCM for 15 and 20 using GCF's of these numbers
The first method to find LCM for numbers 15 and 20 is to find Greatest Common Factor (GCF) of these numbers. Here's the formula:
LCM = (Number1 × Number2) ÷ GCF
GCF of numbers 15 and 20 is 5, so
LCM = (15 × 20) ÷ 5
LCM = 300 ÷ 5
LCM = 60
Finding LCM for 15 and 20 by Listing Multiples
The second method to find LCM for numbers 15 and 20 is to list out the common multiples for both nubmers and pick the first which matching:
Multiples of 15: 15, 30, 45, 60, 75, 90
Multiples of 20: 20, 40, 60, 80, 100
So the LCM for 15 and 20 is 60
Finding LCM for 15 and 20 by Prime Factorization
Another method to find LCM for numbers 15 and 20 is to list all Prime Factors for both numbers and multiply the highest exponent prime factors:
All Prime Factors of 15: 3, 5 (exponent form: 31, 51)
All Prime Factors of 20: 2, 2, 5 (exponent form: 22, 51)
31 × 51 × 22 = 60
Related Calculations
See Also
- Greatest Common Factor - Find the Greatest Common Factor (GCF) of two numbers
<a href="https://calculat.io/en/number/least-common-multiple-lcm-of/15--20">What is the LCM of 15 and 20? - Calculatio</a>
LCM Table
About "Least Common Multiple" Calculator
Least Common Multiple (LCM) also known as the Lowest Common Multiple or Smallest Common Multiple of 2 numbers - it is the smallest positive integer that is divisible by both numbers