GCF (HCF) of 4 and 15

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Greatest Common Factor of
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What is the Greatest Common Divisor of 4 and 15?

Answer

GCF (HCF) of 4 and 15 is
1

Common factors: 1

Only 1 divides both: 4 and 15 share no prime factor.

Such numbers are called coprime (relatively prime); their LCM is just the product: 4 × 15 = 60.

4 = 22

15 = 3 × 5

Prime415Lowest power
222——
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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GCF Table

Number 1Number 2GCF
422
431
451
462
471
484
491
4102
4124
4131
4142
4151
4164
4182
4204
4211
4231
4244
4251
4262
4271
4284
4302
4324
4351
4364
4371
4404
4422
4444

FAQ

What is the Greatest Common Divisor of 4 and 15?

GCF (HCF) of 4 and 15 is 1

How to find the GCF of 4 and 15?

You can find the GCF of 4 and 15 by listing all factors of both numbers and picking the greatest common one, or by prime factorization. The GCF of 4 and 15 is 1.

What prime factors do 4 and 15 share?

4 and 15 have no prime factor in common, so the only integer that divides both of them is 1 and their GCF is 1.

How does the GCF reduce the fraction 4/15?

Divide the numerator and the denominator by the GCF 1: 4 ÷ 1 = 4 and 15 ÷ 1 = 15. So 4/15 in lowest terms is 4/15.

Are 4 and 15 coprime?

Yes, 4 and 15 are coprime (relatively prime) because their Greatest Common Factor is 1.

See Also