GCF (HCF) of 8 and 42

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Greatest Common Factor of
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What is the Greatest Common Divisor of 8 and 42?

Answer

GCF (HCF) of 8 and 42 is
2

Common factors: 1, 2

2 divides both: 8 ÷ 2 = 4, 42 ÷ 2 = 21 — and 4 and 21 share no factor but 1, so no larger number divides both.

8 = 23

42 = 2 × 3 × 7

Prime842Lowest power
22322
3—3—
7—7—

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

GCF = 2

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GCF Table

Number 1Number 2GCF
8191
8204
8211
8248
8251
8262
8271
8284
8291
8302
8328
8331
8351
8364
8408
8422
8431
8444
8451
8488
8491
8502
8524
8531
8568
8591
8604
8631
8648
8728

FAQ

What is the Greatest Common Divisor of 8 and 42?

GCF (HCF) of 8 and 42 is 2

How to find the GCF of 8 and 42?

You can find the GCF of 8 and 42 by listing all factors of both numbers and picking the greatest common one, or by prime factorization. The GCF of 8 and 42 is 2.

What prime factors do 8 and 42 share?

The prime factorizations of 8 and 42 have 2 in common, and multiplying those shared primes gives 2 — exactly the greatest common factor.

How does the GCF reduce the fraction 8/42?

Divide the numerator and the denominator by the GCF 2: 8 ÷ 2 = 4 and 42 ÷ 2 = 21. So 8/42 in lowest terms is 4/21.

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