LCM for 9 and 81

The first method to find LCM for numbers 9 and 81 is to find Greatest Common Factor (GCF) of these numbers. Here's the formula:

LCM = (Number1 × Number2) ÷ GCF

GCF of numbers 9 and 81 is 9, so

LCM = (9 × 81) ÷ 9

LCM = 729 ÷ 9

LCM = 81

The second method to find LCM for numbers 9 and 81 is to list out the common multiples for both nubmers and pick the first which matching:

Multiples of 9: 9, 18, 27, 36, 45, 54, 63, 72, 81, 90, 99

Multiples of 81: 81, 162, 243, 324, 405, 486, 567, 648, 729, 810, 891, [...], 81

So the LCM for 9 and 81 is 81

Another method to find LCM for numbers 9 and 81 is to list all Prime Factors for both numbers and multiply the highest exponent prime factors: