LCM for 42 and 77
What's the Least Common Multiple (LCM) of 42 and 77?
(Four hundred sixty-two)
Finding LCM for 42 and 77 using GCF's of these numbers
The first method to find LCM for numbers 42 and 77 is to find Greatest Common Factor (GCF) of these numbers. Here's the formula:
LCM = (Number1 × Number2) ÷ GCF
GCF of numbers 42 and 77 is 7, so
LCM = (42 × 77) ÷ 7
LCM = 3234 ÷ 7
LCM = 462
Finding LCM for 42 and 77 by Listing Multiples
The second method to find LCM for numbers 42 and 77 is to list out the common multiples for both nubmers and pick the first which matching:
Multiples of 42: 42, 84, 126, 168, 210, 252, 294, 336, 378, 420, 462, 504, 546
Multiples of 77: 77, 154, 231, 308, 385, 462, 539, 616
So the LCM for 42 and 77 is 462
Finding LCM for 42 and 77 by Prime Factorization
Another method to find LCM for numbers 42 and 77 is to list all Prime Factors for both numbers and multiply the highest exponent prime factors:
All Prime Factors of 42: 2, 3, 7 (exponent form: 21, 31, 71)
All Prime Factors of 77: 7, 11 (exponent form: 71, 111)
21 × 31 × 71 × 111 = 462
Related Calculations
See Also
- Greatest Common Factor - Find the Greatest Common Factor (GCF) of two numbers
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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