143231 ÷ 81 
We're looking to find how many times 81 goes into 143231.

Step 1:
If we divide 1 by 81, we get 0 and a remainder of 1.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 1 and we're left with 1.
Append the next digit (4) from the dividend to 1 and continue with: 14 / 81

On to step 2:
81 goes into 14 0 times with a remainder of 14.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 14 and we're left with 14.
Include the next digit (3) from the dividend after 14, then repeat: 143 / 81

Step 3:
The number 81 fits into 143 1 times, leaving a remainder of 62.
Use 1 as the next digit of our solution. 
Result so far: 1.0
Deduct 81 from 143 and we're left with 62.
Bring next digit (2) of the dividend behind the 62 and repeat the process: 622 / 81

Going ahead to step 4:
622 divided by 81 is 7 with a remainder of 55.
Write down 7 as next digit of the result. 
Result so far: 17.0
Subtract 567 from 622 to get 55.
Fetch the next digit (3) from the dividend, attach it to 55 and continue: 553 / 81

Moving on to step 5:
81 can be fit into 553 6 times, resulting in a remainder of 67.
The number 6 becomes the next digit in our result. 
Result so far: 176.0
Deduct 486 from 553 and we're left with 67.
Include the next digit (1) from the dividend after 67, then repeat: 671 / 81

Let's proceed to step 6:
671 divided by 81 is 8 with a remainder of 23.
Write down 8 as next digit of the result. 
Result so far: 1768.0
The remainder is 23 after subtracting 648 from 671.
Since there are no more digits in the dividend, we add a zero to the remainder making it 230, and continue the process.

Advancing to step 7:
The number 81 fits into 230 2 times, leaving a remainder of 68.
The number 2 becomes the next digit in our result. 
Result so far: 1768.2
Subtract 162 from 230 to get 68.
Since there are no more digits in the dividend, we add a zero to the remainder making it 680, and continue the process.

Moving on to step 8:
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: 1768.28
Deduct 648 from 680 and we're left with 32.
Since there are no more digits in the dividend, we add a zero to the remainder making it 320, and continue the process.

On to step 9:
81 can be fit into 320 3 times, resulting in a remainder of 77.
The number 3 becomes the next digit in our result. 
Result so far: 1768.283
The remainder is 77 after subtracting 243 from 320.
Since there are no more digits in the dividend, we add a zero to the remainder making it 770, and continue the process.

On to step 10:
If we divide 770 by 81, we get 9 and a remainder of 41.
Use 9 as the next digit of our solution. 
Result so far: 1768.2839
If we take 729 away from 770, we end up with 41.
Since there are no more digits in the dividend, we add a zero to the remainder making it 410, and continue the process.

On to step 11:
81 can be fit into 410 5 times, resulting in a remainder of 5.
Put 5 as the next digit of the answer. 
Result so far: 1768.28395
Deduct 405 from 410 and we're left 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 12:
If we divide 50 by 81, we get 0 and a remainder of 50.
Record the quotient 0 as the next digit in the result. 
Result so far: 1768.28395
The remainder is 50 after subtracting 0 from 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

Step 13:
When dividing 500 by 81, we get 6 with a remainder of 14.
The next digit of our result is 6. 
Result so far: 1768.2839506
If we take 486 away from 500, we end up with 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Step 14:
81 goes into 140 1 times with a remainder of 59.
Use 1 as the next digit of our solution. 
Result so far: 1768.28395061
Subtract 81 from 140 to get 59.
Since there are no more digits in the dividend, we add a zero to the remainder making it 590, and continue the process.

After the division, we end up with 1768.28395061 and a remainder of 5.9e-08.