LCM for 7 and 84
What's the Least Common Multiple (LCM) of 7 and 84?
(Eighty-four)
Finding LCM for 7 and 84 using GCF's of these numbers
The first method to find LCM for numbers 7 and 84 is to find Greatest Common Factor (GCF) of these numbers. Here's the formula:
LCM = (Number1 × Number2) ÷ GCF
GCF of numbers 7 and 84 is 7, so
LCM = (7 × 84) ÷ 7
LCM = 588 ÷ 7
LCM = 84
Finding LCM for 7 and 84 by Listing Multiples
The second method to find LCM for numbers 7 and 84 is to list out the common multiples for both nubmers and pick the first which matching:
Multiples of 7: 7, 14, 21, 28, 35, 42, 49, 56, 63, 70, 77, 84, 91, 98
Multiples of 84: 84, 168, 252, 336, 420, 504, 588, 672, 756, 840, 924, 1008, 1092, 1176, [...], 84
So the LCM for 7 and 84 is 84
Finding LCM for 7 and 84 by Prime Factorization
Another method to find LCM for numbers 7 and 84 is to list all Prime Factors for both numbers and multiply the highest exponent prime factors:
All Prime Factors of 7: 7 (exponent form: 71)
All Prime Factors of 84: 2, 2, 3, 7 (exponent form: 22, 31, 71)
71 × 22 × 31 = 84
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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