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Q: How can you write 21 as a product of its prime factors?

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3 x 7 = 21

As a product of its prime factors: 3*3*7*7 = 441 Its square root is 21 or as 3*7 as the product of its prime factors

An HCF is the product of any common prime factors of two numbers. If two numbers have no common prime factors, then the HCF will be 1. For example, 10 and 21. The prime factors are 2x5 and 3x7. There is nothing in common, and so the HCF of 10 and 21 is 1. Two consecutive numbers will always have the HCF of 1.

40 and 21 have no common prime factors

The factors of 21 are 1, 3, 7, and 21 which means that 21 is composite.

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It is simply: 3 times 7 = 21

21 as a product of its prime factors is 1 X 3 X 7.

It is: 3*7 = 21

21 = 3 x 7

3 x 7 = 21

It is 3 time 7 = 21

21

As a product of its prime factors: 3*3*7*7 = 441 Its square root is 21 or as 3*7 as the product of its prime factors

It is when the prime factors of whole number are multiplied together that they equal that number. For example the prime factors of 21 are 3 and 7 so 3*7 = 21

The prime factors of 21 are 3,7.

The prime factors of 21 are 3 x 7.

1, 3, 7, 21 3 and 7 are prime.

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