GCF (HCF) of 8 and 15

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What is the Greatest Common Divisor of 8 and 15?

Answer

GCF (HCF) of 8 and 15 is
1

Common factors: 1

Only 1 divides both: 8 and 15 share no prime factor.

Such numbers are called coprime (relatively prime); their LCM is just the product: 8 × 15 = 120.

8 = 23

15 = 3 × 5

Prime815Lowest power
223——
3—3—
5—5—

— = 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
822
831
844
851
862
891
8102
8111
8124
8131
8142
8151
8168
8171
8182
8191
8204
8211
8248
8251
8262
8271
8284
8291
8302
8328
8331
8351
8364
8408

FAQ

What is the Greatest Common Divisor of 8 and 15?

GCF (HCF) of 8 and 15 is 1

How to find the GCF of 8 and 15?

You can find the GCF of 8 and 15 by listing all factors of both numbers and picking the greatest common one, or by prime factorization. The GCF of 8 and 15 is 1.

What prime factors do 8 and 15 share?

8 and 15 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 8/15?

Divide the numerator and the denominator by the GCF 1: 8 ÷ 1 = 8 and 15 ÷ 1 = 15. So 8/15 in lowest terms is 8/15.

Are 8 and 15 coprime?

Yes, 8 and 15 are coprime (relatively prime) because their Greatest Common Factor is 1.

See Also