24 divided by 8 ( The denominator ) = 3 x 3 ( The numerator ) = 9

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Whenever you encounter the phrase, " What is ___ of......." It is most probably a question involving multiplication. So in you question: What is 3/8 of 24? It becomes like this:

 \frac{3}{8}  x 24

If you don't know how to multiply fractions especially, a fraction to a whole number.

Just make 1 the denominator of the whole number to make it a fraction, then: 

1.) Multiply the numerators, the product will be the new numerator.

2.) Multiply all the denominators, the product will be the new denominator.

3.) Use your new numerator and denominator to make the new fraction.

4.) Simplify if possible.

Like this:

 \frac{3}{8}  x 24
  \frac{3}{8}  x  \frac{24}{1}
= 72 / 8
= 9 
So 3/ 8 of 24 is 9.