First let’s set up the problem:
813÷21 Step 1:
Take the whole number, 21, and multiply it by the denominator of the fraction, 8:
8 x 21 = 168
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:
138⋅21=13168 To display the answer to 13/8 Divided by 21 in decimal form, you can divide the numerator, 168, by the denominator, 13. The answer can be rounded to the nearest three decimal points, if needed:
13168=13168=12.92 So, in decimal form, 13 divided by 8/21 = 12.92
And in its simplest fractional form, 13 divided by 8/21 is 168/13