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Firstly, you should recognize the relevant numbers which are 23 and 29. Now let us work out. Every even number is divisible by two, hence not prime. So we can exclude 22, 24, 26 and 28. Meanwhile 21, (24) and 27 are divisible by three. 25 is divisible by 5. The remaining numbers 23 and 29 have no divisors other than 1 and the number itself, hence they are the prime numbers.

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Q: How do I show my work to find out prime numbers between 20 and 30?

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That's an infinite list.

Only in the ones column. Prime numbers aren't multiples of anything but one and themselves.

A 24-hour News channel does not show a factorization ...

3 x 5 x 5 = 75

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Only in the ones column. Prime numbers aren't multiples of anything but one and themselves.

Use a factor tree.

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Showing a composite number as a product of prime numbers is called prime factorization.

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