GCF (HCF) of 4 and 40

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What is the Greatest Common Divisor of 4 and 40?

Answer

GCF (HCF) of 4 and 40 is
4

Common factors: 1, 2, 4

4 divides 40 (40 ÷ 4 = 10), so the GCF is the smaller number itself.

4 = 22

40 = 23 × 5

Prime440Lowest power
2222322
5—5—

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

GCF = 22 = 4

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GCF Table

Number 1Number 2GCF
4124
4131
4142
4151
4164
4182
4204
4211
4231
4244
4251
4262
4271
4284
4324
4351
4371
4404
4444
4451
4484
4524
4531
4571
4604
4804
4811
41004
41204
41,0004

FAQ

What is the Greatest Common Divisor of 4 and 40?

GCF (HCF) of 4 and 40 is 4

How to find the GCF of 4 and 40?

You can find the GCF of 4 and 40 by listing all factors of both numbers and picking the greatest common one, or by prime factorization. The GCF of 4 and 40 is 4.

What prime factors do 4 and 40 share?

The prime factorizations of 4 and 40 have 2 × 2 in common, and multiplying those shared primes gives 4 — exactly the greatest common factor.

How does the GCF reduce the fraction 4/40?

Divide the numerator and the denominator by the GCF 4: 4 ÷ 4 = 1 and 40 ÷ 4 = 10. So 4/40 in lowest terms is 1/10.

See Also