LCM for 7 and 18
What's the Least Common Multiple (LCM) of 7 and 18?
(One hundred twenty-six)
Finding LCM for 7 and 18 using GCF's of these numbers
The first method to find LCM for numbers 7 and 18 is to find Greatest Common Factor (GCF) of these numbers. Here's the formula:
LCM = (Number1 × Number2) ÷ GCF
GCF of numbers 7 and 18 is 1, so
LCM = (7 × 18) ÷ 1
LCM = 126 ÷ 1
LCM = 126
Finding LCM for 7 and 18 by Listing Multiples
The second method to find LCM for numbers 7 and 18 is to list out the common multiples for both nubmers and pick the first which matching:
Multiples of 7: 7, 14, 21, 28, 35, 42, 49, 56, 63, 70, 77, 84, 91, 98, 105, 112, 119, 126, 133, 140
Multiples of 18: 18, 36, 54, 72, 90, 108, 126, 144, 162
So the LCM for 7 and 18 is 126
Finding LCM for 7 and 18 by Prime Factorization
Another method to find LCM for numbers 7 and 18 is to list all Prime Factors for both numbers and multiply the highest exponent prime factors:
All Prime Factors of 7: 7 (exponent form: 71)
All Prime Factors of 18: 2, 3, 3 (exponent form: 21, 32)
71 × 21 × 32 = 126
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/7--18">What is the LCM of 7 and 18? - 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