GCF (HCF) of 7 and 28

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Greatest Common Factor of
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What is the Greatest Common Divisor of 7 and 28?

Answer

GCF (HCF) of 7 and 28 is
7

Common factors: 1, 7

7 divides 28 (28 ÷ 7 = 4), so the GCF is the smaller number itself.

7 — prime

28 = 22 × 7

Prime728Lowest power
2—22—
7777

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

GCF = 7

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GCF Table

Number 1Number 2GCF
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
71057

FAQ

What is the Greatest Common Divisor of 7 and 28?

GCF (HCF) of 7 and 28 is 7

How to find the GCF of 7 and 28?

You can find the GCF of 7 and 28 by listing all factors of both numbers and picking the greatest common one, or by prime factorization. The GCF of 7 and 28 is 7.

What prime factors do 7 and 28 share?

The prime factorizations of 7 and 28 have 7 in common, and multiplying those shared primes gives 7 — exactly the greatest common factor.

How does the GCF reduce the fraction 7/28?

Divide the numerator and the denominator by the GCF 7: 7 ÷ 7 = 1 and 28 ÷ 7 = 4. So 7/28 in lowest terms is 1/4.

See Also