Let's divide 643508 by 81
Let's see how many times 81 fits into 643508.

Let's proceed to step 1:
6 divided by 81 is 0 with a remainder of 6.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 6, we get 6.
Fetch the next digit (4) from the dividend, attach it to 6 and continue: 64 / 81

Going ahead to step 2:
81 can be fit into 64 0 times, resulting in a remainder of 64.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 64, we end up with 64.
Include the next digit (3) from the dividend after 64, then repeat: 643 / 81

Let's proceed to step 3:
643 divided by 81 is 7 with a remainder of 76.
Record the quotient 7 as the next digit in the result. 
Result so far: 7.0
Deduct 567 from 643 and we're left with 76.
Grab the next digit (5) from the dividend, add it to 76, then carry on: 765 / 81

Going ahead to step 4:
81 goes into 765 9 times with a remainder of 36.
Put 9 as the next digit of the answer. 
Result so far: 79.0
The remainder is 36 after subtracting 729 from 765.
Include the next digit (0) from the dividend after 36, then repeat: 360 / 81

Step 5:
When dividing 360 by 81, we get 4 with a remainder of 36.
Use 4 as the next digit of our solution. 
Result so far: 794.0
Subtracting 324 from 360 leaves us with 36.
Bring next digit (8) of the dividend behind the 36 and repeat the process: 368 / 81

Let's proceed to step 6:
When dividing 368 by 81, we get 4 with a remainder of 44.
The number 4 becomes the next digit in our result. 
Result so far: 7944.0
If we subtract 324 from 368, we get 44.
Since there are no more digits in the dividend, we add a zero to the remainder making it 440, and continue the process.

Step 7:
The number 81 fits into 440 5 times, leaving a remainder of 35.
Record the quotient 5 as the next digit in the result. 
Result so far: 7944.5
If we take 405 away from 440, we end up with 35.
Since there are no more digits in the dividend, we add a zero to the remainder making it 350, and continue the process.

Let's proceed to step 8:
81 goes into 350 4 times with a remainder of 26.
The number 4 becomes the next digit in our result. 
Result so far: 7944.54
If we subtract 324 from 350, we get 26.
Since there are no more digits in the dividend, we add a zero to the remainder making it 260, and continue the process.

On to step 9:
81 can be fit into 260 3 times, resulting in a remainder of 17.
Put 3 as the next digit of the answer. 
Result so far: 7944.543
If we subtract 243 from 260, we get 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

Going ahead to step 10:
81 can be fit into 170 2 times, resulting in a remainder of 8.
Put 2 as the next digit of the answer. 
Result so far: 7944.5432
The remainder is 8 after subtracting 162 from 170.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Step 11:
81 can be fit into 80 0 times, resulting in a remainder of 80.
The number 0 becomes the next digit in our result. 
Result so far: 7944.5432
The remainder is 80 after subtracting 0 from 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

Step 12:
800 divided by 81 is 9 with a remainder of 71.
Write down 9 as next digit of the result. 
Result so far: 7944.543209
If we take 729 away from 800, we end up with 71.
Since there are no more digits in the dividend, we add a zero to the remainder making it 710, and continue the process.

Step 13:
81 goes into 710 8 times with a remainder of 62.
The next digit of our result is 8. 
Result so far: 7944.5432098
The remainder is 62 after subtracting 648 from 710.
Since there are no more digits in the dividend, we add a zero to the remainder making it 620, and continue the process.

Step 14:
81 goes into 620 7 times with a remainder of 53.
Record the quotient 7 as the next digit in the result. 
Result so far: 7944.54320987
Subtract 567 from 620 to get 53.
Since there are no more digits in the dividend, we add a zero to the remainder making it 530, and continue the process.

Our division results in 7944.54320987 with a remaining 5.3e-08.