First let’s set up the problem:
912÷21 Step 1:
Take the whole number, 21, and multiply it by the denominator of the fraction, 9:
9 x 21 = 189
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:
129⋅21=12189 To display the answer to 12/9 Divided by 21 in decimal form, you can divide the numerator, 189, by the denominator, 12. The answer can be rounded to the nearest three decimal points, if needed:
12189=463=15.75 So, in decimal form, 12 divided by 9/21 = 15.75
And in its simplest fractional form, 12 divided by 9/21 is 63/4