First let’s set up the problem:
1215÷21 Step 1:
Take the whole number, 21, and multiply it by the denominator of the fraction, 12:
12 x 21 = 252
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:
1512⋅21=15252 To display the answer to 15/12 Divided by 21 in decimal form, you can divide the numerator, 252, by the denominator, 15. The answer can be rounded to the nearest three decimal points, if needed:
15252=584=16.8 So, in decimal form, 15 divided by 12/21 = 16.8
And in its simplest fractional form, 15 divided by 12/21 is 84/5