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GCF for 2, 4 and 15

"Greatest Common Factor of 3 Numbers" Calculator

What's the Greatest Common Factor (GCF) of 2, 4 and 15?

Answer

GCF of 2, 4 and 15 is

1

Common factors: 1

Only 1 divides all three: no prime is a factor of each of 2, 4 and 15.

Pairs do share factors — GCF(2, 4) = 2 — just none greater than 1 common to all three.

2 — prime

4 = 2²

15 = 3 × 5

Prime	2	4	15	Lowest power
2	2	2²	—	—
3	—	—	3	—
5	—	—	5	—

— = power 0: the prime is not a factor of this number, so it cannot be in the GCF.

GCF = 1

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See Also

Least Common Multiple of 3 Numbers - Find the Least Common Multiple (LCM) of three numbers
Greatest Common Factor - Find the Greatest Common Factor (GCF) of two numbers
Least Common Multiple - Find the Least Common Multiple (LCM) of two numbers

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What is the GCF of 2, 4 and 15? The GCF of 2, 4 and 15 is 1 — the largest number that divides all three with no remainder. Step-by-step solution for three numbers.

https://calculat.io/en/number/greatest-common-factor-of-3-numbers/2--4--15/generated.jpg

GCF Table

1st	2nd	3rd	GCF
1	2	4	1
2	2	4	2
2	3	4	1
2	4	4	2
2	4	5	1
2	4	6	2
2	4	7	1
2	4	8	2
2	4	9	1
2	4	10	2
2	4	11	1
2	4	12	2
2	4	13	1
2	4	14	2
2	4	15	1
2	4	16	2
2	4	17	1
2	4	18	2
2	4	19	1
2	4	20	2
2	4	21	1
2	4	22	2
2	4	23	1
2	4	24	2
2	4	25	1
2	4	26	2
2	4	27	1
2	4	28	2
2	4	29	1
2	4	30	2

FAQ

What's the Greatest Common Factor (GCF) of 2, 4 and 15?

GCF of 2, 4 and 15 is 1

What prime factors do 2, 4 and 15 share?

None at all: 2, 4 and 15 have no prime factor in common, so the only positive integer dividing all three is 1 and their GCF is 1.

Can you get the GCF of 2, 4 and 15 two numbers at a time?

Yes. The GCF of 2 and 4 is 2, and the GCF of 2 and 15 is 1 — the same answer, because the greatest common factor is associative and does not depend on the order of the three numbers.

How does the GCF simplify the ratio 2 : 4 : 15?

Divide every term by the GCF 1: 2 ÷ 1 = 2, 4 ÷ 1 = 4 and 15 ÷ 1 = 15. So 2 : 4 : 15 in lowest terms is 2 : 4 : 15, and no whole number other than 1 divides all three of those.

See Also