GCF (HCF) of 7 and 8

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Greatest Common Factor of
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What is the Greatest Common Divisor of 7 and 8?

Answer

GCF (HCF) of 7 and 8 is
1

Common factors: 1

Only 1 divides both: 7 and 8 share no prime factor.

Such numbers are called coprime (relatively prime); their LCM is just the product: 7 × 8 = 56.

7 — prime

8 = 23

Prime78Lowest power
2—23—
77——

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

GCF = 1

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GCF Table

Number 1Number 2GCF
721
741
751
781
791
7101
7111
7121
7131
7147
7151
7161
7171
7181
7191
7201
7217
7241
7251
7287
7301
7357
7361
7427
7431
7461
7497
7511
7567
7637

FAQ

What is the Greatest Common Divisor of 7 and 8?

GCF (HCF) of 7 and 8 is 1

How to find the GCF of 7 and 8?

You can find the GCF of 7 and 8 by listing all factors of both numbers and picking the greatest common one, or by prime factorization. The GCF of 7 and 8 is 1.

What prime factors do 7 and 8 share?

7 and 8 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 7/8?

Divide the numerator and the denominator by the GCF 1: 7 ÷ 1 = 7 and 8 ÷ 1 = 8. So 7/8 in lowest terms is 7/8.

Are 7 and 8 coprime?

Yes, 7 and 8 are coprime (relatively prime) because their Greatest Common Factor is 1.

See Also