First let’s set up the problem:
1512÷21 Step 1:
Take the whole number, 21, and multiply it by the denominator of the fraction, 15:
15 x 21 = 315
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:
1215⋅21=12315 To display the answer to 12/15 Divided by 21 in decimal form, you can divide the numerator, 315, by the denominator, 12. The answer can be rounded to the nearest three decimal points, if needed:
12315=4105=26.25 So, in decimal form, 12 divided by 15/21 = 26.25
And in its simplest fractional form, 12 divided by 15/21 is 105/4