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GCF (HCF) of 42 and 55

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What is the Greatest Common Divisor of 42 and 55?

Answer

GCF (HCF) of 42 and 55 is

1

Common factors: 1

Only 1 divides both: 42 and 55 share no prime factor.

Such numbers are called coprime (relatively prime); their LCM is just the product: 42 × 55 = 2,310.

42 = 2 × 3 × 7

55 = 5 × 11

Prime	42	55	Lowest power
2	2	—	—
3	3	—	—
5	—	5	—
7	7	—	—
11	—	11	—

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

GCF = 1

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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 42 and 55. The GCF of 42 and 55 is 1 — 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
42	28	14
42	44	2
42	45	3
42	46	2
42	48	6
42	49	7
42	50	2
42	51	3
42	52	2
42	54	6
42	55	1
42	56	14
42	57	3
42	58	2
42	59	1
42	60	6
42	63	21
42	65	1
42	70	14
42	72	6
42	80	2
42	84	42
42	86	2
42	90	6
42	96	6
42	98	14
42	100	2
42	105	21
42	231	21
42	1,365	21

FAQ

What is the Greatest Common Divisor of 42 and 55?

GCF (HCF) of 42 and 55 is 1

How to find the GCF of 42 and 55?

You can find the GCF of 42 and 55 by listing all factors of both numbers and picking the greatest common one, or by prime factorization. The GCF of 42 and 55 is 1.

What prime factors do 42 and 55 share?

42 and 55 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 42/55?

Divide the numerator and the denominator by the GCF 1: 42 ÷ 1 = 42 and 55 ÷ 1 = 55. So 42/55 in lowest terms is 42/55.

Are 42 and 55 coprime?

Yes, 42 and 55 are coprime (relatively prime) because their Greatest Common Factor is 1.