66399124 ÷ 823 
Our goal is to divide 66399124 by 823.

Advancing to step 1:
When dividing 6 by 823, we get 0 with a remainder of 6.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 6, we get 6.
Include the next digit (6) from the dividend after 6, then repeat: 66 / 823

Moving on to step 2:
The number 823 fits into 66 0 times, leaving a remainder of 66.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 66, we end up with 66.
Include the next digit (3) from the dividend after 66, then repeat: 663 / 823

Step 3:
When dividing 663 by 823, we get 0 with a remainder of 663.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 663, we end up with 663.
Bring next digit (9) of the dividend behind the 663 and repeat the process: 6639 / 823

Let's proceed to step 4:
823 goes into 6639 8 times with a remainder of 55.
The next digit of our result is 8. 
Result so far: 8.0
Subtracting 6584 from 6639 leaves us with 55.
Include the next digit (9) from the dividend after 55, then repeat: 559 / 823

Moving on to step 5:
When dividing 559 by 823, we get 0 with a remainder of 559.
Record the quotient 0 as the next digit in the result. 
Result so far: 80.0
Subtracting 0 from 559 leaves us with 559.
Include the next digit (1) from the dividend after 559, then repeat: 5591 / 823

Moving on to step 6:
If we divide 5591 by 823, we get 6 and a remainder of 653.
Record the quotient 6 as the next digit in the result. 
Result so far: 806.0
If we subtract 4938 from 5591, we get 653.
Take the next digit (2) from the dividend and append it to 653, then repeat: 6532 / 823

On to step 7:
The number 823 fits into 6532 7 times, leaving a remainder of 771.
Write down 7 as next digit of the result. 
Result so far: 8067.0
Subtracting 5761 from 6532 leaves us with 771.
Append the next digit (4) from the dividend to 771 and continue with: 7714 / 823

Moving on to step 8:
If we divide 7714 by 823, we get 9 and a remainder of 307.
Put 9 as the next digit of the answer. 
Result so far: 80679.0
If we take 7407 away from 7714, we end up with 307.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3070, and continue the process.

Going ahead to step 9:
3070 divided by 823 is 3 with a remainder of 601.
Write down 3 as next digit of the result. 
Result so far: 80679.3
The remainder is 601 after subtracting 2469 from 3070.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6010, and continue the process.

On to step 10:
823 can be fit into 6010 7 times, resulting in a remainder of 249.
The next digit of our result is 7. 
Result so far: 80679.37
Deduct 5761 from 6010 and we're left with 249.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2490, and continue the process.

On to step 11:
823 can be fit into 2490 3 times, resulting in a remainder of 21.
Record the quotient 3 as the next digit in the result. 
Result so far: 80679.373
Deduct 2469 from 2490 and we're left with 21.
Since there are no more digits in the dividend, we add a zero to the remainder making it 210, and continue the process.

Step 12:
When dividing 210 by 823, we get 0 with a remainder of 210.
The next digit of our result is 0. 
Result so far: 80679.373
Subtract 0 from 210 to get 210.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2100, and continue the process.

Advancing to step 13:
If we divide 2100 by 823, we get 2 and a remainder of 454.
Record the quotient 2 as the next digit in the result. 
Result so far: 80679.37302
Subtracting 1646 from 2100 leaves us with 454.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4540, and continue the process.

Going ahead to step 14:
When dividing 4540 by 823, we get 5 with a remainder of 425.
Use 5 as the next digit of our solution. 
Result so far: 80679.373025
Deduct 4115 from 4540 and we're left with 425.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4250, and continue the process.

Advancing to step 15:
823 goes into 4250 5 times with a remainder of 135.
Record the quotient 5 as the next digit in the result. 
Result so far: 80679.3730255
Subtract 4115 from 4250 to get 135.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1350, and continue the process.

The quotient of the division is 80679.3730255, and the remainder is 1.35e-06.