GCF (HCF) of 63 and 81

"Greatest Common Factor" Calculator
Greatest Common Factor of
and

What is the Greatest Common Divisor of 63 and 81?

Answer

GCF (HCF) of 63 and 81 is
9

Common factors: 1, 3, 9

9 divides both: 63 ÷ 9 = 7, 81 ÷ 9 = 9 — and 7 and 9 share no factor but 1, so no larger number divides both.

63 = 32 × 7

81 = 34

Prime6381Lowest power
3323432
77——

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

GCF = 32 = 9

More with these numbers

Related Calculations

See Also

GCF Table

Number 1Number 2GCF
63663
63671
63681
63693
63707
63711
63729
63731
63741
63753
63761
63777
63783
63791
63801
63819
63821
63831
638421
63851
63861
63873
63881
63891
63909
63917
63921
63933
63941
63951

FAQ

What is the Greatest Common Divisor of 63 and 81?

GCF (HCF) of 63 and 81 is 9

How to find the GCF of 63 and 81?

You can find the GCF of 63 and 81 by listing all factors of both numbers and picking the greatest common one, or by prime factorization. The GCF of 63 and 81 is 9.

What prime factors do 63 and 81 share?

The prime factorizations of 63 and 81 have 3 × 3 in common, and multiplying those shared primes gives 9 — exactly the greatest common factor.

How does the GCF reduce the fraction 63/81?

Divide the numerator and the denominator by the GCF 9: 63 ÷ 9 = 7 and 81 ÷ 9 = 9. So 63/81 in lowest terms is 7/9.

See Also