Let's divide 839521 by 66
We want to figure out the number of times 839521 can be divided by 66.

Advancing to step 1:
8 divided by 66 is 0 with a remainder of 8.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 8 after subtracting 0 from 8.
Fetch the next digit (3) from the dividend, attach it to 8 and continue: 83 / 66

Going ahead to step 2:
If we divide 83 by 66, we get 1 and a remainder of 17.
The next digit of our result is 1. 
Result so far: 1.0
If we take 66 away from 83, we end up with 17.
Take the next digit (9) from the dividend and append it to 17, then repeat: 179 / 66

Moving on to step 3:
66 can be fit into 179 2 times, resulting in a remainder of 47.
Use 2 as the next digit of our solution. 
Result so far: 12.0
If we subtract 132 from 179, we get 47.
Bring next digit (5) of the dividend behind the 47 and repeat the process: 475 / 66

Step 4:
475 divided by 66 is 7 with a remainder of 13.
The number 7 becomes the next digit in our result. 
Result so far: 127.0
Deduct 462 from 475 and we're left with 13.
Bring next digit (2) of the dividend behind the 13 and repeat the process: 132 / 66

Moving on to step 5:
When dividing 132 by 66, we get 2 with a remainder of 0.
Use 2 as the next digit of our solution. 
Result so far: 1272.0
The remainder is 0 after subtracting 132 from 132.
Bring next digit (1) of the dividend behind the 0 and repeat the process: 1 / 66

Advancing to step 6:
66 goes into 1 0 times with a remainder of 1.
Use 0 as the next digit of our solution. 
Result so far: 12720.0
Subtract 0 from 1 to get 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Let's proceed to step 7:
10 divided by 66 is 0 with a remainder of 10.
Use 0 as the next digit of our solution. 
Result so far: 12720.0
The remainder is 10 after subtracting 0 from 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Let's proceed to step 8:
66 can be fit into 100 1 times, resulting in a remainder of 34.
Put 1 as the next digit of the answer. 
Result so far: 12720.01
If we subtract 66 from 100, we get 34.
Since there are no more digits in the dividend, we add a zero to the remainder making it 340, and continue the process.

Moving on to step 9:
66 goes into 340 5 times with a remainder of 10.
Put 5 as the next digit of the answer. 
Result so far: 12720.015
The remainder is 10 after subtracting 330 from 340.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Advancing to step 10:
If we divide 100 by 66, we get 1 and a remainder of 34.
The next digit of our result is 1. 
Result so far: 12720.0151
Deduct 66 from 100 and we're left with 34.
Since there are no more digits in the dividend, we add a zero to the remainder making it 340, and continue the process.

Step 11:
66 can be fit into 340 5 times, resulting in a remainder of 10.
Use 5 as the next digit of our solution. 
Result so far: 12720.01515
Subtracting 330 from 340 leaves us with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Going ahead to step 12:
66 goes into 100 1 times with a remainder of 34.
The next digit of our result is 1. 
Result so far: 12720.015151
If we take 66 away from 100, we end up with 34.
Since there are no more digits in the dividend, we add a zero to the remainder making it 340, and continue the process.

Advancing to step 13:
66 can be fit into 340 5 times, resulting in a remainder of 10.
Use 5 as the next digit of our solution. 
Result so far: 12720.0151515
Deduct 330 from 340 and we're left with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Going ahead to step 14:
The number 66 fits into 100 1 times, leaving a remainder of 34.
Use 1 as the next digit of our solution. 
Result so far: 12720.01515151
Subtract 66 from 100 to get 34.
Since there are no more digits in the dividend, we add a zero to the remainder making it 340, and continue the process.

In conclusion, the division gives 12720.01515151 with a balance of 3.4e-08.