GCF (HCF) of 4 and 5

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Greatest Common Factor of
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What is the Greatest Common Divisor of 4 and 5?

Answer

GCF (HCF) of 4 and 5 is
1

Common factors: 1

Only 1 divides both: 4 and 5 share no prime factor.

Such numbers are called coprime (relatively prime); their LCM is just the product: 4 × 5 = 20.

4 = 22

5 — prime

Prime45Lowest power
222——
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
4324
4351
4371
4404
4444
4451
4484
4524

FAQ

What is the Greatest Common Divisor of 4 and 5?

GCF (HCF) of 4 and 5 is 1

How to find the GCF of 4 and 5?

You can find the GCF of 4 and 5 by listing all factors of both numbers and picking the greatest common one, or by prime factorization. The GCF of 4 and 5 is 1.

What prime factors do 4 and 5 share?

4 and 5 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 4/5?

Divide the numerator and the denominator by the GCF 1: 4 ÷ 1 = 4 and 5 ÷ 1 = 5. So 4/5 in lowest terms is 4/5.

Are 4 and 5 coprime?

Yes, 4 and 5 are coprime (relatively prime) because their Greatest Common Factor is 1.

See Also