GCF (HCF) of 85 and 90

"Greatest Common Factor" Calculator

What is the Greatest Common Divisor of 85 and 90?

Answer

GCF (HCF) of 85 and 90 is

Common factors: 1, 5

5 divides both: 85 ÷ 5 = 17, 90 ÷ 5 = 18 — and 17 and 18 share no factor but 1, so no larger number divides both.

85 = 5 × 17

90 = 2 × 3² × 5

Prime	85	90	Lowest power
2	—	2	—
3	—	3²	—
5	5	5	5
17	17	—	—

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

GCF = 5

More with these numbers

Related Calculations

GCF Table

Number 1	Number 2	GCF
85	75	5
85	76	1
85	77	1
85	78	1
85	79	1
85	80	5
85	81	1
85	82	1
85	83	1
85	84	1
85	85	85
85	86	1
85	87	1
85	88	1
85	89	1
85	90	5
85	91	1
85	92	1
85	93	1
85	94	1
85	95	5
85	96	1
85	97	1
85	98	1
85	99	1
85	100	5
85	101	1
85	102	17
85	103	1
85	104	1

FAQ

What is the Greatest Common Divisor of 85 and 90?

GCF (HCF) of 85 and 90 is 5

How to find the GCF of 85 and 90?

You can find the GCF of 85 and 90 by listing all factors of both numbers and picking the greatest common one, or by prime factorization. The GCF of 85 and 90 is 5.

What prime factors do 85 and 90 share?

The prime factorizations of 85 and 90 have 5 in common, and multiplying those shared primes gives 5 — exactly the greatest common factor.

How does the GCF reduce the fraction 85/90?

Divide the numerator and the denominator by the GCF 5: 85 ÷ 5 = 17 and 90 ÷ 5 = 18. So 85/90 in lowest terms is 17/18.

GCF (HCF) of 85 and 90

What is the Greatest Common Divisor of 85 and 90?

More with these numbers

Related Calculations

See Also

GCF Table

FAQ

What is the Greatest Common Divisor of 85 and 90?

How to find the GCF of 85 and 90?

What prime factors do 85 and 90 share?

How does the GCF reduce the fraction 85/90?

See Also

Number 1	Number 2	GCF
85	75	5
85	76	1
85	77	1
85	78	1
85	79	1
85	80	5
85	81	1
85	82	1
85	83	1
85	84	1
85	85	85
85	86	1
85	87	1
85	88	1
85	89	1
85	90	5
85	91	1
85	92	1
85	93	1
85	94	1
85	95	5
85	96	1
85	97	1
85	98	1
85	99	1
85	100	5
85	101	1
85	102	17
85	103	1
85	104	1

Number 1	Number 2	GCF
85	75	5
85	76	1
85	77	1
85	78	1
85	79	1
85	80	5
85	81	1
85	82	1
85	83	1
85	84	1
85	85	85
85	86	1
85	87	1
85	88	1
85	89	1
85	90	5
85	91	1
85	92	1
85	93	1
85	94	1
85	95	5
85	96	1
85	97	1
85	98	1
85	99	1
85	100	5
85	101	1
85	102	17
85	103	1
85	104	1

Number 1	Number 2	GCF
85	75	5
85	76	1
85	77	1
85	78	1
85	79	1
85	80	5
85	81	1
85	82	1
85	83	1
85	84	1
85	85	85
85	86	1
85	87	1
85	88	1
85	89	1
85	90	5
85	91	1
85	92	1
85	93	1
85	94	1
85	95	5
85	96	1
85	97	1
85	98	1
85	99	1
85	100	5
85	101	1
85	102	17
85	103	1
85	104	1