GCF (HCF) of 15 and 16

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Greatest Common Factor of
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What is the Greatest Common Divisor of 15 and 16?

Answer

GCF (HCF) of 15 and 16 is
1

Common factors: 1

Only 1 divides both: 15 and 16 share no prime factor.

Such numbers are called coprime (relatively prime); their LCM is just the product: 15 × 16 = 240.

15 = 3 × 5

16 = 24

Prime1516Lowest power
2—24—
33——
55——

— = 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
1555
1563
1593
15105
15123
15161
15171
15183
15205
15213
15221
15231
15243
15255
15261
15273
15281
15291
153015
15321
15333
15355
15363
15381
15405
15423
15441
154515
15483
15491

FAQ

What is the Greatest Common Divisor of 15 and 16?

GCF (HCF) of 15 and 16 is 1

How to find the GCF of 15 and 16?

You can find the GCF of 15 and 16 by listing all factors of both numbers and picking the greatest common one, or by prime factorization. The GCF of 15 and 16 is 1.

What prime factors do 15 and 16 share?

15 and 16 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 15/16?

Divide the numerator and the denominator by the GCF 1: 15 ÷ 1 = 15 and 16 ÷ 1 = 16. So 15/16 in lowest terms is 15/16.

Are 15 and 16 coprime?

Yes, 15 and 16 are coprime (relatively prime) because their Greatest Common Factor is 1.

See Also