First let’s set up the problem:
312÷21 Step 1:
Take the whole number, 21, and multiply it by the denominator of the fraction, 3:
3 x 21 = 63
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:
123⋅21=1263 To display the answer to 12/3 Divided by 21 in decimal form, you can divide the numerator, 63, by the denominator, 12. The answer can be rounded to the nearest three decimal points, if needed:
1263=421=5.25 So, in decimal form, 12 divided by 3/21 = 5.25
And in its simplest fractional form, 12 divided by 3/21 is 21/4