LCM for 42 and 45
What's the Least Common Multiple (LCM) of 42 and 45?
Answer
(Six hundred thirty)
Finding LCM for 42 and 45 using GCF of these numbers
The first method to find LCM for numbers 42 and 45 is to find Greatest Common Factor (GCF) of these numbers. Here's the formula:
LCM = (Number1 × Number2) ÷ GCF
GCF of numbers 42 and 45 is 3, so
LCM = (42 × 45) ÷ 3
LCM = 1890 ÷ 3
LCM = 630
Finding LCM for 42 and 45 by Listing Multiples
The second method to find LCM for numbers 42 and 45 is to list out the common multiples for both numbers and pick the first one that matches:
Multiples of 42: 42, 84, 126, 168, 210, 252, 294, 336, 378, 420, 462, 504, 546, 588, 630, 672, 714
Multiples of 45: 45, 90, 135, 180, 225, 270, 315, 360, 405, 450, 495, 540, 585, 630, 675, 720
So the LCM for 42 and 45 is 630
Finding LCM for 42 and 45 by Prime Factorization
Another method to find LCM for numbers 42 and 45 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 45: 3, 3, 5 (exponent form: 32, 51)
21 × 32 × 71 × 51 = 630
Related Calculations
See Also
- Greatest Common Factor - Find the Greatest Common Factor (GCF) of two numbers
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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