First let’s set up the problem:
918÷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:
189⋅21=18189 To display the answer to 18/9 Divided by 21 in decimal form, you can divide the numerator, 189, by the denominator, 18. The answer can be rounded to the nearest three decimal points, if needed:
18189=221=10.5 So, in decimal form, 18 divided by 9/21 = 10.5
And in its simplest fractional form, 18 divided by 9/21 is 21/2