LCM for 5 and 20

The first method to find LCM for numbers 5 and 20 is to find Greatest Common Factor (GCF) of these numbers. Here's the formula:

LCM = (Number1 × Number2) ÷ GCF

GCF of numbers 5 and 20 is 5, so

LCM = (5 × 20) ÷ 5

LCM = 100 ÷ 5

LCM = 20

The second method to find LCM for numbers 5 and 20 is to list out the common multiples for both nubmers and pick the first which matching:

Multiples of 5: 5, 10, 15, 20, 25, 30

Multiples of 20: 20, 40, 60, 80, 100, 120, [...], 20

So the LCM for 5 and 20 is 20

Another method to find LCM for numbers 5 and 20 is to list all Prime Factors for both numbers and multiply the highest exponent prime factors: