GCF (HCF) of 40 and 80

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What is the Greatest Common Divisor of 40 and 80?

Answer

GCF (HCF) of 40 and 80 is
40

Common factors: 1, 2, 4, 5, 8, 10, 20, 40

40 divides 80 (80 ÷ 40 = 2), so the GCF is the smaller number itself.

40 = 23 × 5

80 = 24 × 5

Prime4080Lowest power
2232423
5555

GCF = 23 × 5 = 40

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GCF Table

Number 1Number 2GCF
405010
40524
40531
40542
40555
40568
40582
40591
406020
40631
40648
40655
40662
407010
40728
408040
40844
40855
409010
40968
4010020
4011010
4012040
401255
4013010
401448
401555
4016040
401655
4018020

FAQ

What is the Greatest Common Divisor of 40 and 80?

GCF (HCF) of 40 and 80 is 40

How to find the GCF of 40 and 80?

You can find the GCF of 40 and 80 by listing all factors of both numbers and picking the greatest common one, or by prime factorization. The GCF of 40 and 80 is 40.

What prime factors do 40 and 80 share?

The prime factorizations of 40 and 80 have 2 × 2 × 2 × 5 in common, and multiplying those shared primes gives 40 — exactly the greatest common factor.

How does the GCF reduce the fraction 40/80?

Divide the numerator and the denominator by the GCF 40: 40 ÷ 40 = 1 and 80 ÷ 40 = 2. So 40/80 in lowest terms is 1/2.

See Also