GCF (HCF) of 40 and 220

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What is the Greatest Common Divisor of 40 and 220?

Answer

GCF (HCF) of 40 and 220 is
20

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

20 divides both: 40 ÷ 20 = 2, 220 ÷ 20 = 11 — and 2 and 11 share no factor but 1, so no larger number divides both.

40 = 23 × 5

220 = 22 × 5 × 11

Prime40220Lowest power
2232222
5555
11—11—

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

GCF = 22 × 5 = 20

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GCF Table

Number 1Number 2GCF
40844
40855
409010
40968
4010020
4011010
4012040
401255
4013010
401448
401555
4016040
401655
4018020
4021010
4022020
4024040
402455
4025010
4026020
402655
402755
4031010
403155
4032040
403255
4033010
403355
4034020
4035010

FAQ

What is the Greatest Common Divisor of 40 and 220?

GCF (HCF) of 40 and 220 is 20

How to find the GCF of 40 and 220?

You can find the GCF of 40 and 220 by listing all factors of both numbers and picking the greatest common one, or by prime factorization. The GCF of 40 and 220 is 20.

What prime factors do 40 and 220 share?

The prime factorizations of 40 and 220 have 2 × 2 × 5 in common, and multiplying those shared primes gives 20 — exactly the greatest common factor.

How does the GCF reduce the fraction 40/220?

Divide the numerator and the denominator by the GCF 20: 40 ÷ 20 = 2 and 220 ÷ 20 = 11. So 40/220 in lowest terms is 2/11.

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