Let's divide 639397 by 66
We're looking to find how many times 66 goes into 639397.

On to step 1:
66 goes into 6 0 times with a remainder of 6.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 6 to get 6.
Fetch the next digit (3) from the dividend, attach it to 6 and continue: 63 / 66

Step 2:
63 divided by 66 is 0 with a remainder of 63.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 63, we get 63.
Fetch the next digit (9) from the dividend, attach it to 63 and continue: 639 / 66

Advancing to step 3:
66 can be fit into 639 9 times, resulting in a remainder of 45.
Write down 9 as next digit of the result. 
Result so far: 9.0
The remainder is 45 after subtracting 594 from 639.
Grab the next digit (3) from the dividend, add it to 45, then carry on: 453 / 66

Let's proceed to step 4:
If we divide 453 by 66, we get 6 and a remainder of 57.
The number 6 becomes the next digit in our result. 
Result so far: 96.0
If we take 396 away from 453, we end up with 57.
Bring next digit (9) of the dividend behind the 57 and repeat the process: 579 / 66

Let's proceed to step 5:
66 can be fit into 579 8 times, resulting in a remainder of 51.
Put 8 as the next digit of the answer. 
Result so far: 968.0
Subtract 528 from 579 to get 51.
Include the next digit (7) from the dividend after 51, then repeat: 517 / 66

On to step 6:
66 goes into 517 7 times with a remainder of 55.
Write down 7 as next digit of the result. 
Result so far: 9687.0
Deduct 462 from 517 and we're left with 55.
Since there are no more digits in the dividend, we add a zero to the remainder making it 550, and continue the process.

Step 7:
66 can be fit into 550 8 times, resulting in a remainder of 22.
Write down 8 as next digit of the result. 
Result so far: 9687.8
Subtracting 528 from 550 leaves us with 22.
Since there are no more digits in the dividend, we add a zero to the remainder making it 220, and continue the process.

On to step 8:
66 goes into 220 3 times with a remainder of 22.
Use 3 as the next digit of our solution. 
Result so far: 9687.83
Deduct 198 from 220 and we're left with 22.
Since there are no more digits in the dividend, we add a zero to the remainder making it 220, and continue the process.

Step 9:
If we divide 220 by 66, we get 3 and a remainder of 22.
Record the quotient 3 as the next digit in the result. 
Result so far: 9687.833
If we take 198 away from 220, we end up with 22.
Since there are no more digits in the dividend, we add a zero to the remainder making it 220, and continue the process.

Our division results in 9687.833 with a remaining 0.0022.