LCM for 7 and 28

The first method to find LCM for numbers 7 and 28 is to find Greatest Common Factor (GCF) of these numbers. Here's the formula:

LCM = (Number1 × Number2) ÷ GCF

GCF of numbers 7 and 28 is 7, so

LCM = (7 × 28) ÷ 7

LCM = 196 ÷ 7

LCM = 28

The second method to find LCM for numbers 7 and 28 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

Multiples of 28: 28, 56, 84, 112, 140, 168, [...], 28

So the LCM for 7 and 28 is 28

Another method to find LCM for numbers 7 and 28 is to list all Prime Factors for both numbers and multiply the highest exponent prime factors: