LCM for 15 and 45
What's the Least Common Multiple (LCM) of 15 and 45?
(Forty-five)
Finding LCM for 15 and 45 using GCF's of these numbers
The first method to find LCM for numbers 15 and 45 is to find Greatest Common Factor (GCF) of these numbers. Here's the formula:
LCM = (Number1 × Number2) ÷ GCF
GCF of numbers 15 and 45 is 15, so
LCM = (15 × 45) ÷ 15
LCM = 675 ÷ 15
LCM = 45
Finding LCM for 15 and 45 by Listing Multiples
The second method to find LCM for numbers 15 and 45 is to list out the common multiples for both nubmers and pick the first which matching:
Multiples of 15: 15, 30, 45, 60, 75
Multiples of 45: 45, 90, 135, 180, 225, [...], 45
So the LCM for 15 and 45 is 45
Finding LCM for 15 and 45 by Prime Factorization
Another method to find LCM for numbers 15 and 45 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 45: 3, 3, 5 (exponent form: 32, 51)
32 × 51 = 45
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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