LCM for 4 and 5

"Least Common Multiple" Calculator

Least Common Multiple of

and

What's the Least Common Multiple (LCM) of 4 and 5?

Answer: LCM of 4 and 5 is 20

(Twenty)

Finding LCM for 4 and 5 using GCF's of these numbers

The first method to find LCM for numbers 4 and 5 is to find Greatest Common Factor (GCF) of these numbers. Here's the formula:

LCM = (Number1 × Number2) ÷ GCF

GCF of numbers 4 and 5 is 1, so

LCM = (4 × 5) ÷ 1

LCM = 20 ÷ 1

LCM = 20

Finding LCM for 4 and 5 by Listing Multiples

The second method to find LCM for numbers 4 and 5 is to list out the common multiples for both nubmers and pick the first which matching:

Multiples of 4: 4, 8, 12, 16, 20, 24, 28

Multiples of 5: 5, 10, 15, 20, 25, 30

So the LCM for 4 and 5 is 20

Finding LCM for 4 and 5 by Prime Factorization

Another method to find LCM for numbers 4 and 5 is to list all Prime Factors for both numbers and multiply the highest exponent prime factors:

All Prime Factors of 4: 2, 2 (exponent form: 22)

All Prime Factors of 5: 5 (exponent form: 51)

22 × 51 = 20

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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 4 and 5? (The answer is: 20). Select the first number (e.g. '4') and the second number (e.g. '5'). 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
155
2510
3515
4520
555
6530
7535
8540
9545
10510
11555
12560
13565
14570
15515
16580
17585
18590
19595
20520
215105
225110
235115
245120
25525
265130
275135
285140
295145
30530

FAQ

What's the Least Common Multiple (LCM) of 4 and 5?

LCM of 4 and 5 is 20

See Also