First let’s set up the problem:
312÷81 Step 1:
Take the whole number, 81, and multiply it by the denominator of the fraction, 3:
3 x 81 = 243
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⋅81=12243 To display the answer to 12/3 Divided by 81 in decimal form, you can divide the numerator, 243, by the denominator, 12. The answer can be rounded to the nearest three decimal points, if needed:
12243=481=20.25 So, in decimal form, 12 divided by 3/81 = 20.25
And in its simplest fractional form, 12 divided by 3/81 is 81/4