We're dividing 668508 by 81 
We're looking to find how many times 81 goes into 668508.

Step 1:
6 divided by 81 is 0 with a remainder of 6.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 6, we get 6.
Grab the next digit (6) from the dividend, add it to 6, then carry on: 66 / 81

Advancing to step 2:
The number 81 fits into 66 0 times, leaving a remainder of 66.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 66, we end up with 66.
Append the next digit (8) from the dividend to 66 and continue with: 668 / 81

On to step 3:
668 divided by 81 is 8 with a remainder of 20.
Write down 8 as next digit of the result. 
Result so far: 8.0
Deduct 648 from 668 and we're left with 20.
Fetch the next digit (5) from the dividend, attach it to 20 and continue: 205 / 81

Going ahead to step 4:
If we divide 205 by 81, we get 2 and a remainder of 43.
Use 2 as the next digit of our solution. 
Result so far: 82.0
The remainder is 43 after subtracting 162 from 205.
Fetch the next digit (0) from the dividend, attach it to 43 and continue: 430 / 81

Step 5:
If we divide 430 by 81, we get 5 and a remainder of 25.
Use 5 as the next digit of our solution. 
Result so far: 825.0
Subtracting 405 from 430 leaves us with 25.
Bring next digit (8) of the dividend behind the 25 and repeat the process: 258 / 81

Step 6:
258 divided by 81 is 3 with a remainder of 15.
Put 3 as the next digit of the answer. 
Result so far: 8253.0
Deduct 243 from 258 and we're left with 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Moving on to step 7:
81 goes into 150 1 times with a remainder of 69.
The number 1 becomes the next digit in our result. 
Result so far: 8253.1
Subtract 81 from 150 to get 69.
Since there are no more digits in the dividend, we add a zero to the remainder making it 690, and continue the process.

Let's proceed to step 8:
The number 81 fits into 690 8 times, leaving a remainder of 42.
Use 8 as the next digit of our solution. 
Result so far: 8253.18
If we take 648 away from 690, we end up with 42.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

Step 9:
81 goes into 420 5 times with a remainder of 15.
The next digit of our result is 5. 
Result so far: 8253.185
If we take 405 away from 420, we end up with 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Going ahead to step 10:
81 goes into 150 1 times with a remainder of 69.
Write down 1 as next digit of the result. 
Result so far: 8253.1851
The remainder is 69 after subtracting 81 from 150.
Since there are no more digits in the dividend, we add a zero to the remainder making it 690, and continue the process.

Step 11:
81 goes into 690 8 times with a remainder of 42.
Write down 8 as next digit of the result. 
Result so far: 8253.18518
If we subtract 648 from 690, we get 42.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

Moving on to step 12:
420 divided by 81 is 5 with a remainder of 15.
The number 5 becomes the next digit in our result. 
Result so far: 8253.185185
Subtract 405 from 420 to get 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Going ahead to step 13:
81 goes into 150 1 times with a remainder of 69.
Put 1 as the next digit of the answer. 
Result so far: 8253.1851851
If we take 81 away from 150, we end up with 69.
Since there are no more digits in the dividend, we add a zero to the remainder making it 690, and continue the process.

Advancing to step 14:
When dividing 690 by 81, we get 8 with a remainder of 42.
Put 8 as the next digit of the answer. 
Result so far: 8253.18518518
Subtracting 648 from 690 leaves us with 42.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

Our division results in 8253.18518518 with a remaining 4.2e-08.