LCM for 18 and 20

"Least Common Multiple" Calculator

Least Common Multiple of

and

What's the Least Common Multiple (LCM) of 18 and 20?

Answer: LCM of 18 and 20 is 180

(One hundred eighty)

Finding LCM for 18 and 20 using GCF's of these numbers

The first method to find LCM for numbers 18 and 20 is to find Greatest Common Factor (GCF) of these numbers. Here's the formula:

LCM = (Number1 × Number2) ÷ GCF

GCF of numbers 18 and 20 is 2, so

LCM = (18 × 20) ÷ 2

LCM = 360 ÷ 2

LCM = 180

Finding LCM for 18 and 20 by Listing Multiples

The second method to find LCM for numbers 18 and 20 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, 216

Multiples of 20: 20, 40, 60, 80, 100, 120, 140, 160, 180, 200, 220

So the LCM for 18 and 20 is 180

Finding LCM for 18 and 20 by Prime Factorization

Another method to find LCM for numbers 18 and 20 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 20: 2, 2, 5 (exponent form: 22, 51)

22 × 32 × 51 = 180

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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 20? (The answer is: 180). Select the first number (e.g. '18') and the second number (e.g. '20'). 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
32060
42020
52020
62060
720140
82040
920180
102020
1120220
122060
1320260
1420140
152060
162080
1720340
1820180
1920380
202020
2120420
2220220
2320460
2420120
2520100
2620260
2720540
2820140
2920580
302060
3120620
3220160

FAQ

What's the Least Common Multiple (LCM) of 18 and 20?

LCM of 18 and 20 is 180

See Also