LCM for 1 and 20
What's the Least Common Multiple (LCM) of 1 and 20?
(Twenty)
Finding LCM for 1 and 20 using GCF's of these numbers
The first method to find LCM for numbers 1 and 20 is to find Greatest Common Factor (GCF) of these numbers. Here's the formula:
LCM = (Number1 × Number2) ÷ GCF
GCF of numbers 1 and 20 is 1, so
LCM = (1 × 20) ÷ 1
LCM = 20 ÷ 1
LCM = 20
Finding LCM for 1 and 20 by Listing Multiples
The second method to find LCM for numbers 1 and 20 is to list out the common multiples for both nubmers and pick the first which matching:
Multiples of 1: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22
Multiples of 20: 20, 40, 60, 80, 100, 120, 140, 160, 180, 200, 220, 240, 260, 280, 300, 320, 340, 360, 380, 400, 420, 440, [...], 20
So the LCM for 1 and 20 is 20
Finding LCM for 1 and 20 by Prime Factorization
Another method to find LCM for numbers 1 and 20 is to list all Prime Factors for both numbers and multiply the highest exponent prime factors:
All Prime Factors of 1: 1 (exponent form: 11)
All Prime Factors of 20: 2, 2, 5 (exponent form: 22, 51)
11 × 22 × 51 = 20
Related Calculations
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