Q: What are 3 pairs of numbers that have 5 as their GCF?

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The only factor that all of these numbers share is 1 since 3 and 5 are prime. So 1 is the gcf of this set of numbers.

The GCF is 5.

Write the numbers in their prime factorisations. the GCF is the product of the common primes (each time they appear). Example: 30 and 42 2 x 3 x 5 = 30 2 x 3 x 7 = 42 Select the common factors. 2 x 3 = 6, the GCF Example: 24 and 60 24 = 2 × 2 × 2 × 3 60 = 2 × 2 × 3 × 5 GCF = 2 × 2 × 3 = 12 The prime 2 appears twice in both numbers. If you use the power format of the prime factorisation, the GCF is the product of each of the common primes to the LOWEST power across the numbers. For 24 and 60 this gives: 24 = 2³ × 3 60 = 2² × 3 × 5 → GCF = 2² × 3 = 12 As the lowest power of 2 across the numbers is 2², the lowest power of 3 across the numbers is 3 = 3¹, 5 is not common, but for completeness, 24 = 2³ × 3¹ × 5⁰ since 5⁰ = 1, so the lowest power of the prime 5 across the numbers is 5⁰: → GCF = 2² × 3¹ × 5⁰ = 4 × 3 × 1 = 12.

15*3 = 3*5*3 = 3*3*5 18*5 = 2*3*3*5 = 2*3*3*5 So GCF = numbers that appear in both lists (however many times in both) = 3*3*5 = 45

5 and any multiple of 5 5,10 5,15 5,20

Related questions

5 and 105 and 1510 and 15

The GCF is 1.

None of those pairs has a GCF of 15.

The GCF of two prime numbers is always 1. 3 and 5 are both prime numbers so, GCF (3, 5) = 1.

The only factor that all of these numbers share is 1 since 3 and 5 are prime. So 1 is the gcf of this set of numbers.

Try 5, 10 and 15.

Two numbers are relatively prime if they have no factors in common other than 1. This means their greatest common factor (GCF) is 1. Here are examples of pairs of numbers that are relatively prime: 2, 9 5, 14 13, 998 3, 379 37, 303 691, 701 32, 81 384, 625 Here are examples of pairs of numbers that are not relatively prime: 2, 8 (GCF: 2) 16, 1060 (GCF: 4) 52, 117 (GCF: 13)

You need at least two numbers to find a GCF. If that's 3 and 15, the GCF is 3.

No. The GCF of 3 and 5 is 1. The GCF of 3 and 9 is 3.

The GCF of 5 and 10 is 5.

The GCF is 5.

factor out both numbers to get 102=2*3*17 50=2*5*5 the GCF is 2