398166 ÷ 72 
We want to figure out the number of times 398166 can be divided by 72.

Advancing to step 1:
72 can be fit into 3 0 times, resulting in a remainder of 3.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 3 and we're left with 3.
Bring next digit (9) of the dividend behind the 3 and repeat the process: 39 / 72

Going ahead to step 2:
39 divided by 72 is 0 with a remainder of 39.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 39, we get 39.
Append the next digit (8) from the dividend to 39 and continue with: 398 / 72

Moving on to step 3:
When dividing 398 by 72, we get 5 with a remainder of 38.
Use 5 as the next digit of our solution. 
Result so far: 5.0
The remainder is 38 after subtracting 360 from 398.
Fetch the next digit (1) from the dividend, attach it to 38 and continue: 381 / 72

Step 4:
If we divide 381 by 72, we get 5 and a remainder of 21.
Put 5 as the next digit of the answer. 
Result so far: 55.0
If we take 360 away from 381, we end up with 21.
Append the next digit (6) from the dividend to 21 and continue with: 216 / 72

Let's proceed to step 5:
If we divide 216 by 72, we get 3 and a remainder of 0.
Record the quotient 3 as the next digit in the result. 
Result so far: 553.0
Subtracting 216 from 216 leaves us with 0.
Fetch the next digit (6) from the dividend, attach it to 0 and continue: 6 / 72

Let's proceed to step 6:
72 can be fit into 6 0 times, resulting in a remainder of 6.
The number 0 becomes the next digit in our result. 
Result so far: 5530.0
If we subtract 0 from 6, we get 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Step 7:
72 can be fit into 60 0 times, resulting in a remainder of 60.
Use 0 as the next digit of our solution. 
Result so far: 5530.0
If we subtract 0 from 60, we get 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Going ahead to step 8:
600 divided by 72 is 8 with a remainder of 24.
The number 8 becomes the next digit in our result. 
Result so far: 5530.08
Subtracting 576 from 600 leaves us with 24.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

Advancing to step 9:
72 can be fit into 240 3 times, resulting in a remainder of 24.
Write down 3 as next digit of the result. 
Result so far: 5530.083
Subtracting 216 from 240 leaves us with 24.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

Moving on to step 10:
72 goes into 240 3 times with a remainder of 24.
Use 3 as the next digit of our solution. 
Result so far: 5530.0833
Subtract 216 from 240 to get 24.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

The final result is 5530.0833 with a remainder of 0.00024.