GCF (HCF) of 100 and 345

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What is the Greatest Common Divisor of 100 and 345?

Answer

GCF (HCF) of 100 and 345 is
5

Common factors: 1, 5

5 divides both: 100 ÷ 5 = 20, 345 ÷ 5 = 69 — and 20 and 69 share no factor but 1, so no larger number divides both.

100 = 22 × 52

345 = 3 × 5 × 23

Prime100345Lowest power
222——
3—3—
55255
23—23—

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

GCF = 5

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GCF Table

Number 1Number 2GCF
10023010
1002355
10024020
1002455
10025050
10026020
10027010
10027525
10028020
10029010
100300100
1003055
10031010
1003155
1003355
1003455
10035050
10036020
10037010
10038020
1003955
100400100
10041010
1004155
10042020
10042525
10043010
1004355
10044020
1004455

FAQ

What is the Greatest Common Divisor of 100 and 345?

GCF (HCF) of 100 and 345 is 5

How to find the GCF of 100 and 345?

You can find the GCF of 100 and 345 by listing all factors of both numbers and picking the greatest common one, or by prime factorization. The GCF of 100 and 345 is 5.

What prime factors do 100 and 345 share?

The prime factorizations of 100 and 345 have 5 in common, and multiplying those shared primes gives 5 — exactly the greatest common factor.

How does the GCF reduce the fraction 100/345?

Divide the numerator and the denominator by the GCF 5: 100 ÷ 5 = 20 and 345 ÷ 5 = 69. So 100/345 in lowest terms is 20/69.

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