LCM for 4 and 28
What's the Least Common Multiple (LCM) of 4 and 28?
(Twenty-eight)
Finding LCM for 4 and 28 using GCF's of these numbers
The first method to find LCM for numbers 4 and 28 is to find Greatest Common Factor (GCF) of these numbers. Here's the formula:
LCM = (Number1 × Number2) ÷ GCF
GCF of numbers 4 and 28 is 4, so
LCM = (4 × 28) ÷ 4
LCM = 112 ÷ 4
LCM = 28
Finding LCM for 4 and 28 by Listing Multiples
The second method to find LCM for numbers 4 and 28 is to list out the common multiples for both nubmers and pick the first which matching:
Multiples of 4: 4, 8, 12, 16, 20, 24, 28, 32, 36
Multiples of 28: 28, 56, 84, 112, 140, 168, 196, 224, 252, [...], 28
So the LCM for 4 and 28 is 28
Finding LCM for 4 and 28 by Prime Factorization
Another method to find LCM for numbers 4 and 28 is to list all Prime Factors for both numbers and multiply the highest exponent prime factors:
All Prime Factors of 4: 2, 2 (exponent form: 22)
All Prime Factors of 28: 2, 2, 7 (exponent form: 22, 71)
22 × 71 = 28
Related Calculations
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