How many primes are there in the number 45?

Anonymous

∙ 13y ago

Updated: 10/17/2024

This question is on my daughter's homework--Which shows 45 as a product of primes?

(A) 15 x 3 (B) 3 x 5 x 3 (C) 1 x 5 x 9 (D) 1 x 3 x 15

Please help

B. 3 and 5 are primes.

Reject:

A and D: 15 = 3*5 and so 15 is not prime.

C: 9 = 3*3 and so 9 is not a prime.

Wiki User

∙ 13y ago

What else can I help you with?

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45 = 3 x 3 x 5

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Factor both numbers into primes. Circle any common primes and multiply them/ 45=3x3x5 54=2x3x3x3 3x3=9 GCF

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45 = 3 x 3 x 5

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only one has and that is the number 3

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25 primes.

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Believe it or not, the number of prime numbers beginning with 8 is infinite.

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there are 13 primes not 5.

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45 15,3 5,3,3 3 x 3 x 5 = 45