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GCF (HCF) of 40 and 80

"Greatest Common Factor" Calculator

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

Prime	40	80	Lowest power
2	2³	2⁴	2³
5	5	5	5

GCF = 2³ × 5 = 40

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See Also

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

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What is the GCF (HCF) of 40 and 80. The GCF of 40 and 80 is 40 — the biggest number that can divide both integers. Step-by-step GCF (GCD) calculation by factoring.

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GCF Table

Number 1	Number 2	GCF
40	50	10
40	52	4
40	53	1
40	54	2
40	55	5
40	56	8
40	58	2
40	59	1
40	60	20
40	63	1
40	64	8
40	65	5
40	66	2
40	70	10
40	72	8
40	80	40
40	84	4
40	85	5
40	90	10
40	96	8
40	100	20
40	110	10
40	120	40
40	125	5
40	130	10
40	144	8
40	155	5
40	160	40
40	165	5
40	180	20

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.