LCM for 42 and 56
What's the Least Common Multiple (LCM) of 42 and 56?
(One hundred sixty-eight)
Finding LCM for 42 and 56 using GCF's of these numbers
The first method to find LCM for numbers 42 and 56 is to find Greatest Common Factor (GCF) of these numbers. Here's the formula:
LCM = (Number1 × Number2) ÷ GCF
GCF of numbers 42 and 56 is 14, so
LCM = (42 × 56) ÷ 14
LCM = 2352 ÷ 14
LCM = 168
Finding LCM for 42 and 56 by Listing Multiples
The second method to find LCM for numbers 42 and 56 is to list out the common multiples for both nubmers and pick the first which matching:
Multiples of 42: 42, 84, 126, 168, 210, 252
Multiples of 56: 56, 112, 168, 224, 280
So the LCM for 42 and 56 is 168
Finding LCM for 42 and 56 by Prime Factorization
Another method to find LCM for numbers 42 and 56 is to list all Prime Factors for both numbers and multiply the highest exponent prime factors:
All Prime Factors of 42: 2, 3, 7 (exponent form: 21, 31, 71)
All Prime Factors of 56: 2, 2, 2, 7 (exponent form: 23, 71)
23 × 31 × 71 = 168
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/42--56">What is the LCM of 42 and 56? - 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