First let’s set up the problem:
510÷21 Step 1:
Take the whole number, 21, and multiply it by the denominator of the fraction, 5:
5 x 21 = 105
Step 2:
The result of this multiplication will now become the denominator of the answer. The answer to the problem in fraction form can now be seen:
105⋅21=10105 To display the answer to 10/5 Divided by 21 in decimal form, you can divide the numerator, 105, by the denominator, 10. The answer can be rounded to the nearest three decimal points, if needed:
10105=221=10.5 So, in decimal form, 10 divided by 5/21 = 10.5
And in its simplest fractional form, 10 divided by 5/21 is 21/2