What is the LCM of 20 and 80?

"Least Common Multiple" Calculator

What's the Least Common Multiple (LCM) of 20 and 80?

Answer: LCM of 20 and 80 is 80

(Eighty)

Finding LCM for 20 and 80 using GCF's of these numbers

The first method to find LCM for numbers 20 and 80 is to find Greatest Common Factor (GCF) of these numbers. Here's the formula:

LCM = (Number1 × Number2) ÷ GCF

GCF of numbers 20 and 80 is 20, so

LCM = (20 × 80) ÷ 20

LCM = 1600 ÷ 20

LCM = 80

Finding LCM for 20 and 80 by Listing Multiples

The second method to find LCM for numbers 20 and 80 is to list out the common multiples for both nubmers and pick the first which matching:

Multiples of 20: 20, 40, 60, 80, 100, 120

Multiples of 80: 80, 160, 240, 320, 400, 480, [...], 80

So the LCM for 20 and 80 is 80

Finding LCM for 20 and 80 by Prime Factorization

Another method to find LCM for numbers 20 and 80 is to list all Prime Factors for both numbers and multiply the highest exponent prime factors:

All Prime Factors of 20: 2, 2, 5 (exponent form: 2², 5¹)

All Prime Factors of 80: 2, 2, 2, 2, 5 (exponent form: 2⁴, 5¹)

2⁴ × 5¹ = 80

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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 20 and 80? (The answer is: 80). Select the first number (e.g. '20') and the second number (e.g. '80'). 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

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LCM Table

Number 1	Number 2	LCM
5	80	80
6	80	240
7	80	560
8	80	80
9	80	720
10	80	80
11	80	880
12	80	240
13	80	1040
14	80	560
15	80	240
16	80	80
17	80	1360
18	80	720
19	80	1520
20	80	80
21	80	1680
22	80	880
23	80	1840
24	80	240
25	80	400
26	80	1040
27	80	2160
28	80	560
29	80	2320
30	80	240
31	80	2480
32	80	160
33	80	2640
34	80	1360

LCM for 20 and 80

"Least Common Multiple" Calculator

What's the Least Common Multiple (LCM) of 20 and 80?

Finding LCM for 20 and 80 using GCF's of these numbers

Finding LCM for 20 and 80 by Listing Multiples

Finding LCM for 20 and 80 by Prime Factorization

Related Calculations

See Also

About "Least Common Multiple" Calculator

"Least Common Multiple" Calculator

LCM Table

FAQ

What's the Least Common Multiple (LCM) of 20 and 80?

See Also