173903 ÷ 81 
We're looking to find how many times 81 goes into 173903.

Moving on to step 1:
81 can be fit into 1 0 times, resulting in a remainder of 1.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 1, we get 1.
Grab the next digit (7) from the dividend, add it to 1, then carry on: 17 / 81

On to step 2:
When dividing 17 by 81, we get 0 with a remainder of 17.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 17, we get 17.
Include the next digit (3) from the dividend after 17, then repeat: 173 / 81

Step 3:
81 goes into 173 2 times with a remainder of 11.
Write down 2 as next digit of the result. 
Result so far: 2.0
If we subtract 162 from 173, we get 11.
Grab the next digit (9) from the dividend, add it to 11, then carry on: 119 / 81

Step 4:
The number 81 fits into 119 1 times, leaving a remainder of 38.
Record the quotient 1 as the next digit in the result. 
Result so far: 21.0
If we subtract 81 from 119, we get 38.
Include the next digit (0) from the dividend after 38, then repeat: 380 / 81

Advancing to step 5:
380 divided by 81 is 4 with a remainder of 56.
Use 4 as the next digit of our solution. 
Result so far: 214.0
Subtract 324 from 380 to get 56.
Append the next digit (3) from the dividend to 56 and continue with: 563 / 81

Moving on to step 6:
When dividing 563 by 81, we get 6 with a remainder of 77.
Use 6 as the next digit of our solution. 
Result so far: 2146.0
Subtract 486 from 563 to get 77.
Since there are no more digits in the dividend, we add a zero to the remainder making it 770, and continue the process.

Advancing to step 7:
81 goes into 770 9 times with a remainder of 41.
The next digit of our result is 9. 
Result so far: 2146.9
If we subtract 729 from 770, we get 41.
Since there are no more digits in the dividend, we add a zero to the remainder making it 410, and continue the process.

Step 8:
81 can be fit into 410 5 times, resulting in a remainder of 5.
The number 5 becomes the next digit in our result. 
Result so far: 2146.95
Subtracting 405 from 410 leaves us with 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Step 9:
When dividing 50 by 81, we get 0 with a remainder of 50.
Record the quotient 0 as the next digit in the result. 
Result so far: 2146.95
If we subtract 0 from 50, we get 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

On to step 10:
If we divide 500 by 81, we get 6 and a remainder of 14.
Use 6 as the next digit of our solution. 
Result so far: 2146.9506
The remainder is 14 after subtracting 486 from 500.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Let's proceed to step 11:
When dividing 140 by 81, we get 1 with a remainder of 59.
The number 1 becomes the next digit in our result. 
Result so far: 2146.95061
Deduct 81 from 140 and we're left with 59.
Since there are no more digits in the dividend, we add a zero to the remainder making it 590, and continue the process.

Let's proceed to step 12:
The number 81 fits into 590 7 times, leaving a remainder of 23.
The number 7 becomes the next digit in our result. 
Result so far: 2146.950617
If we subtract 567 from 590, we get 23.
Since there are no more digits in the dividend, we add a zero to the remainder making it 230, and continue the process.

On to step 13:
The number 81 fits into 230 2 times, leaving a remainder of 68.
Use 2 as the next digit of our solution. 
Result so far: 2146.9506172
Subtracting 162 from 230 leaves us with 68.
Since there are no more digits in the dividend, we add a zero to the remainder making it 680, and continue the process.

Step 14:
When dividing 680 by 81, we get 8 with a remainder of 32.
Write down 8 as next digit of the result. 
Result so far: 2146.95061728
The remainder is 32 after subtracting 648 from 680.
Since there are no more digits in the dividend, we add a zero to the remainder making it 320, and continue the process.

After the division, we end up with 2146.95061728 and a remainder of 3.2e-08.