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Common factors of what? More info or this is not possible to answer.

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3 times 7 for 21 and 7 times 4 for 28

The GCF is 4.

Q: What is the set of common factors of twenty one and twenty eight?

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factors: 9: 1,3,9 15: 1,3,5,15 common afctors: 1,3 greatest common factor: 3

You need at least two numbers to find a GCF.

Its factors are 1, 3, 7 and 21

There is only one proper common factor of 12 and 38; it is 2. Mathematicians do not consider 1 to be a proper factor, because it divides everything.

In any list of distinct numbers, one will be greater than the others. In the list of common factors, one will be the greatest.

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one hundred twenty-eight

The factors of six are one, two, three, and six. The factors of twenty six are one, two, thirteen, and twenty six. Two is the only factor of six that is also a factor of twenty six besides one. Therefore, two is the greatest common factor of six and twenty six.

It is eight and twenty one thousandths.

The factors of seven are 1 and 7 (beca use 7 is a prime number) The factors of eight are 1, 2, 4, 8 The factors of twenty are 1, 2, 4, 5, 10, 20 The most common factor is one

1 and 7

It is eight and twenty one thousandths.

One-seventh of twenty eight is four.

Eight hundred and twenty one million = 821,000,000

The number is "one hundred twenty-eight and fifty one-hundredths" or "one hundred twenty-eight point five zero". In currency, it would be "one hundred and twenty-eight dollars and fifty cents", commonly shortened to "one twenty eight fifty".

Eight over twenty one is in simplest form.

Twenty-one and eight hundredths as a fraction = 527/25

Forty-eight thousand, one hundred twenty-eight.