LCM for 18 and 81

"Least Common Multiple" Calculator

Least Common Multiple of

and

What's the Least Common Multiple (LCM) of 18 and 81?

Answer: LCM of 18 and 81 is 162

(One hundred sixty-two)

Finding LCM for 18 and 81 using GCF's of these numbers

The first method to find LCM for numbers 18 and 81 is to find Greatest Common Factor (GCF) of these numbers. Here's the formula:

LCM = (Number1 × Number2) ÷ GCF

GCF of numbers 18 and 81 is 9, so

LCM = (18 × 81) ÷ 9

LCM = 1458 ÷ 9

LCM = 162

Finding LCM for 18 and 81 by Listing Multiples

The second method to find LCM for numbers 18 and 81 is to list out the common multiples for both nubmers and pick the first which matching:

Multiples of 18: 18, 36, 54, 72, 90, 108, 126, 144, 162, 180, 198

Multiples of 81: 81, 162, 243, 324

So the LCM for 18 and 81 is 162

Finding LCM for 18 and 81 by Prime Factorization

Another method to find LCM for numbers 18 and 81 is to list all Prime Factors for both numbers and multiply the highest exponent prime factors:

All Prime Factors of 18: 2, 3, 3 (exponent form: 21, 32)

All Prime Factors of 81: 3, 3, 3, 3 (exponent form: 34)

21 × 34 = 162

Related Calculations

See Also

About "Least Common Multiple" Calculator

This calculator will help you find the Least Common Multiple (LCM) of two numbers. For example, it can help you find out what's the Least Common Multiple (LCM) of 18 and 81? (The answer is: 162). Select the first number (e.g. '18') and the second number (e.g. '81'). After that hit the 'Calculate' button.
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

"Least Common Multiple" Calculator

Least Common Multiple of

and

LCM Table

Number 1Number 2LCM
38181
481324
581405
681162
781567
881648
98181
1081810
1181891
1281324
13811053
14811134
1581405
16811296
17811377
1881162
19811539
20811620
2181567
22811782
23811863
2481648
25812025
26812106
278181
28812268
29812349
3081810
31812511
32812592

FAQ

What's the Least Common Multiple (LCM) of 18 and 81?

LCM of 18 and 81 is 162

See Also