We look at the division of 639724 by 66 
Let's see how many times 66 fits into 639724.

On to step 1:
When dividing 6 by 66, we get 0 with a remainder of 6.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 6 and we're left with 6.
Include the next digit (3) from the dividend after 6, then repeat: 63 / 66

Advancing to step 2:
66 can be fit into 63 0 times, resulting in a remainder of 63.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 63, we end up with 63.
Include the next digit (9) from the dividend after 63, then repeat: 639 / 66

Advancing to step 3:
When dividing 639 by 66, we get 9 with a remainder of 45.
The next digit of our result is 9. 
Result so far: 9.0
Subtract 594 from 639 to get 45.
Grab the next digit (7) from the dividend, add it to 45, then carry on: 457 / 66

Going ahead to step 4:
When dividing 457 by 66, we get 6 with a remainder of 61.
Record the quotient 6 as the next digit in the result. 
Result so far: 96.0
Deduct 396 from 457 and we're left with 61.
Include the next digit (2) from the dividend after 61, then repeat: 612 / 66

Step 5:
612 divided by 66 is 9 with a remainder of 18.
Record the quotient 9 as the next digit in the result. 
Result so far: 969.0
Subtract 594 from 612 to get 18.
Append the next digit (4) from the dividend to 18 and continue with: 184 / 66

Going ahead to step 6:
If we divide 184 by 66, we get 2 and a remainder of 52.
The next digit of our result is 2. 
Result so far: 9692.0
The remainder is 52 after subtracting 132 from 184.
Since there are no more digits in the dividend, we add a zero to the remainder making it 520, and continue the process.

Advancing to step 7:
If we divide 520 by 66, we get 7 and a remainder of 58.
Put 7 as the next digit of the answer. 
Result so far: 9692.7
Subtract 462 from 520 to get 58.
Since there are no more digits in the dividend, we add a zero to the remainder making it 580, and continue the process.

Let's proceed to step 8:
The number 66 fits into 580 8 times, leaving a remainder of 52.
Write down 8 as next digit of the result. 
Result so far: 9692.78
The remainder is 52 after subtracting 528 from 580.
Since there are no more digits in the dividend, we add a zero to the remainder making it 520, and continue the process.

Advancing to step 9:
520 divided by 66 is 7 with a remainder of 58.
Put 7 as the next digit of the answer. 
Result so far: 9692.787
If we subtract 462 from 520, we get 58.
Since there are no more digits in the dividend, we add a zero to the remainder making it 580, and continue the process.

Moving on to step 10:
When dividing 580 by 66, we get 8 with a remainder of 52.
Record the quotient 8 as the next digit in the result. 
Result so far: 9692.7878
If we take 528 away from 580, we end up 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.

Going ahead to step 11:
If we divide 520 by 66, we get 7 and a remainder of 58.
The next digit of our result is 7. 
Result so far: 9692.78787
Subtracting 462 from 520 leaves us with 58.
Since there are no more digits in the dividend, we add a zero to the remainder making it 580, and continue the process.

Going ahead to step 12:
If we divide 580 by 66, we get 8 and a remainder of 52.
Use 8 as the next digit of our solution. 
Result so far: 9692.787878
If we subtract 528 from 580, we get 52.
Since there are no more digits in the dividend, we add a zero to the remainder making it 520, and continue the process.

Let's proceed to step 13:
When dividing 520 by 66, we get 7 with a remainder of 58.
Use 7 as the next digit of our solution. 
Result so far: 9692.7878787
The remainder is 58 after subtracting 462 from 520.
Since there are no more digits in the dividend, we add a zero to the remainder making it 580, and continue the process.

Advancing to step 14:
66 goes into 580 8 times with a remainder of 52.
Put 8 as the next digit of the answer. 
Result so far: 9692.78787878
Deduct 528 from 580 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.

The final result is 9692.78787878 with a remainder of 5.2e-08.