GCF (HCF) of 3 and 5

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Greatest Common Factor of
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What is the Greatest Common Divisor of 3 and 5?

Answer

GCF (HCF) of 3 and 5 is
1

Common factors: 1

Only 1 divides both: 3 and 5 share no prime factor.

Such numbers are called coprime (relatively prime); their LCM is just the product: 3 × 5 = 15.

3 — prime

5 — prime

Prime35Lowest power
33——
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
311
321
333
341
351
363
371
381
393
3101
3111
3123
3141
3153
3161
3171
3183
3191
3213
3221
3243
3251
3273
3303
3341
3363
3423
3453
3461
3471

FAQ

What is the Greatest Common Divisor of 3 and 5?

GCF (HCF) of 3 and 5 is 1

How to find the GCF of 3 and 5?

You can find the GCF of 3 and 5 by listing all factors of both numbers and picking the greatest common one, or by prime factorization. The GCF of 3 and 5 is 1.

What prime factors do 3 and 5 share?

3 and 5 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 3/5?

Divide the numerator and the denominator by the GCF 1: 3 ÷ 1 = 3 and 5 ÷ 1 = 5. So 3/5 in lowest terms is 3/5.

Are 3 and 5 coprime?

Yes, 3 and 5 are coprime (relatively prime) because their Greatest Common Factor is 1.

See Also