LCM for 18 and 31
What's the Least Common Multiple (LCM) of 18 and 31?
(Five hundred fifty-eight)
Finding LCM for 18 and 31 using GCF's of these numbers
The first method to find LCM for numbers 18 and 31 is to find Greatest Common Factor (GCF) of these numbers. Here's the formula:
LCM = (Number1 × Number2) ÷ GCF
GCF of numbers 18 and 31 is 1, so
LCM = (18 × 31) ÷ 1
LCM = 558 ÷ 1
LCM = 558
Finding LCM for 18 and 31 by Listing Multiples
The second method to find LCM for numbers 18 and 31 is to list out the common multiples for both nubmers and pick the first which matching:
Multiples of 18: 18, 36, 54, 72, 90, 108, 126, 144, 162, 180, 198, 216, 234, 252, 270, 288, 306, 324, 342, 360, 378, 396, 414, 432, 450, 468, 486, 504, 522, 540, 558, 576, 594
Multiples of 31: 31, 62, 93, 124, 155, 186, 217, 248, 279, 310, 341, 372, 403, 434, 465, 496, 527, 558, 589, 620
So the LCM for 18 and 31 is 558
Finding LCM for 18 and 31 by Prime Factorization
Another method to find LCM for numbers 18 and 31 is to list all Prime Factors for both numbers and multiply the highest exponent prime factors:
All Prime Factors of 18: 2, 3, 3 (exponent form: 21, 32)
All Prime Factors of 31: 31 (exponent form: 311)
21 × 32 × 311 = 558
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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