LCM for 7 and 18

The first method to find LCM for numbers 7 and 18 is to find Greatest Common Factor (GCF) of these numbers. Here's the formula:

LCM = (Number1 × Number2) ÷ GCF

GCF of numbers 7 and 18 is 1, so

LCM = (7 × 18) ÷ 1

LCM = 126 ÷ 1

LCM = 126

The second method to find LCM for numbers 7 and 18 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, 49, 56, 63, 70, 77, 84, 91, 98, 105, 112, 119, 126, 133, 140

Multiples of 18: 18, 36, 54, 72, 90, 108, 126, 144, 162

So the LCM for 7 and 18 is 126

Another method to find LCM for numbers 7 and 18 is to list all Prime Factors for both numbers and multiply the highest exponent prime factors: