First let’s set up the problem:
1213÷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:
1312⋅21=13252 To display the answer to 13/12 Divided by 21 in decimal form, you can divide the numerator, 252, by the denominator, 13. The answer can be rounded to the nearest three decimal points, if needed:
13252=13252=19.38 So, in decimal form, 13 divided by 12/21 = 19.38
And in its simplest fractional form, 13 divided by 12/21 is 252/13