LCM for 21 and 49
"Least Common Multiple" Calculator
What's the Least Common Multiple (LCM) of 21 and 49?
(One hundred forty-seven)
Finding LCM for 21 and 49 using GCF's of these numbers
The first method to find LCM for numbers 21 and 49 is to find Greatest Common Factor (GCF) of these numbers. Here's the formula:
LCM = (Number1 × Number2) ÷ GCF
GCF of numbers 21 and 49 is 7, so
LCM = (21 × 49) ÷ 7
LCM = 1029 ÷ 7
LCM = 147
Finding LCM for 21 and 49 by Listing Multiples
The second method to find LCM for numbers 21 and 49 is to list out the common multiples for both nubmers and pick the first which matching:
Multiples of 21: 21, 42, 63, 84, 105, 126, 147, 168, 189
Multiples of 49: 49, 98, 147, 196, 245
So the LCM for 21 and 49 is 147
Finding LCM for 21 and 49 by Prime Factorization
Another method to find LCM for numbers 21 and 49 is to list all Prime Factors for both numbers and multiply the highest exponent prime factors:
All Prime Factors of 21: 3, 7 (exponent form: 31, 71)
All Prime Factors of 49: 7, 7 (exponent form: 72)
31 × 72 = 147
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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
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What's the Least Common Multiple (LCM) of 21 and 49?
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- Наименьшее общее кратное 21 и 49