We're dividing 639428 by 66 
We want to figure out the number of times 639428 can be divided by 66.

Going ahead to step 1:
6 divided by 66 is 0 with a remainder of 6.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 6, we end up with 6.
Fetch the next digit (3) from the dividend, attach it to 6 and continue: 63 / 66

On to step 2:
66 can be fit into 63 0 times, resulting in a remainder of 63.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 63, we end up with 63.
Take the next digit (9) from the dividend and append it to 63, then repeat: 639 / 66

Going ahead to step 3:
66 can be fit into 639 9 times, resulting in a remainder of 45.
The number 9 becomes the next digit in our result. 
Result so far: 9.0
Subtracting 594 from 639 leaves us with 45.
Append the next digit (4) from the dividend to 45 and continue with: 454 / 66

On to step 4:
66 can be fit into 454 6 times, resulting in a remainder of 58.
The next digit of our result is 6. 
Result so far: 96.0
Deduct 396 from 454 and we're left with 58.
Include the next digit (2) from the dividend after 58, then repeat: 582 / 66

Step 5:
66 can be fit into 582 8 times, resulting in a remainder of 54.
Put 8 as the next digit of the answer. 
Result so far: 968.0
Subtract 528 from 582 to get 54.
Include the next digit (8) from the dividend after 54, then repeat: 548 / 66

Let's proceed to step 6:
The number 66 fits into 548 8 times, leaving a remainder of 20.
The next digit of our result is 8. 
Result so far: 9688.0
If we subtract 528 from 548, we get 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Moving on to step 7:
66 can be fit into 200 3 times, resulting in a remainder of 2.
Write down 3 as next digit of the result. 
Result so far: 9688.3
If we take 198 away from 200, we end up with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Advancing to step 8:
20 divided by 66 is 0 with a remainder of 20.
The number 0 becomes the next digit in our result. 
Result so far: 9688.3
Deduct 0 from 20 and we're left with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Advancing to step 9:
66 goes into 200 3 times with a remainder of 2.
Use 3 as the next digit of our solution. 
Result so far: 9688.303
Subtract 198 from 200 to get 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Step 10:
66 goes into 20 0 times with a remainder of 20.
Put 0 as the next digit of the answer. 
Result so far: 9688.303
Deduct 0 from 20 and we're left with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Let's proceed to step 11:
66 goes into 200 3 times with a remainder of 2.
Write down 3 as next digit of the result. 
Result so far: 9688.30303
If we subtract 198 from 200, we get 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Moving on to step 12:
66 goes into 20 0 times with a remainder of 20.
Record the quotient 0 as the next digit in the result. 
Result so far: 9688.30303
If we take 0 away from 20, we end up with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Let's proceed to step 13:
200 divided by 66 is 3 with a remainder of 2.
Write down 3 as next digit of the result. 
Result so far: 9688.3030303
If we subtract 198 from 200, we get 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Advancing to step 14:
When dividing 20 by 66, we get 0 with a remainder of 20.
Use 0 as the next digit of our solution. 
Result so far: 9688.3030303
Subtract 0 from 20 to get 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

In conclusion, the division gives 9688.3030303 with a balance of 2e-08.