We look at the division of 21339080 by 766 
We want to divide 21339080 by 766.

On to step 1:
When dividing 2 by 766, we get 0 with a remainder of 2.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 2 leaves us with 2.
Append the next digit (1) from the dividend to 2 and continue with: 21 / 766

On to step 2:
The number 766 fits into 21 0 times, leaving a remainder of 21.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 21 leaves us with 21.
Take the next digit (3) from the dividend and append it to 21, then repeat: 213 / 766

Going ahead to step 3:
If we divide 213 by 766, we get 0 and a remainder of 213.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 213 and we're left with 213.
Bring next digit (3) of the dividend behind the 213 and repeat the process: 2133 / 766

Moving on to step 4:
766 goes into 2133 2 times with a remainder of 601.
The number 2 becomes the next digit in our result. 
Result so far: 2.0
Subtract 1532 from 2133 to get 601.
Grab the next digit (9) from the dividend, add it to 601, then carry on: 6019 / 766

Advancing to step 5:
766 goes into 6019 7 times with a remainder of 657.
Write down 7 as next digit of the result. 
Result so far: 27.0
If we subtract 5362 from 6019, we get 657.
Include the next digit (0) from the dividend after 657, then repeat: 6570 / 766

On to step 6:
766 goes into 6570 8 times with a remainder of 442.
The next digit of our result is 8. 
Result so far: 278.0
Subtract 6128 from 6570 to get 442.
Bring next digit (8) of the dividend behind the 442 and repeat the process: 4428 / 766

Step 7:
If we divide 4428 by 766, we get 5 and a remainder of 598.
Put 5 as the next digit of the answer. 
Result so far: 2785.0
The remainder is 598 after subtracting 3830 from 4428.
Take the next digit (0) from the dividend and append it to 598, then repeat: 5980 / 766

Let's proceed to step 8:
5980 divided by 766 is 7 with a remainder of 618.
Record the quotient 7 as the next digit in the result. 
Result so far: 27857.0
The remainder is 618 after subtracting 5362 from 5980.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6180, and continue the process.

Moving on to step 9:
If we divide 6180 by 766, we get 8 and a remainder of 52.
Record the quotient 8 as the next digit in the result. 
Result so far: 27857.8
Deduct 6128 from 6180 and we're left with 52.
Since there are no more digits in the dividend, we add a zero to the remainder making it 520, and continue the process.

On to step 10:
766 goes into 520 0 times with a remainder of 520.
Put 0 as the next digit of the answer. 
Result so far: 27857.8
Deduct 0 from 520 and we're left with 520.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5200, and continue the process.

Advancing to step 11:
When dividing 5200 by 766, we get 6 with a remainder of 604.
Write down 6 as next digit of the result. 
Result so far: 27857.806
Subtract 4596 from 5200 to get 604.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6040, and continue the process.

Advancing to step 12:
6040 divided by 766 is 7 with a remainder of 678.
The number 7 becomes the next digit in our result. 
Result so far: 27857.8067
Subtract 5362 from 6040 to get 678.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6780, and continue the process.

Advancing to step 13:
6780 divided by 766 is 8 with a remainder of 652.
The number 8 becomes the next digit in our result. 
Result so far: 27857.80678
Subtract 6128 from 6780 to get 652.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6520, and continue the process.

Advancing to step 14:
6520 divided by 766 is 8 with a remainder of 392.
Record the quotient 8 as the next digit in the result. 
Result so far: 27857.806788
Subtracting 6128 from 6520 leaves us with 392.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3920, and continue the process.

The final outcome is 27857.806788, with a leftover of 3.92e-05.