390641 ÷ 66 
We want to figure out the number of times 390641 can be divided by 66.

On to step 1:
3 divided by 66 is 0 with a remainder of 3.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 3 and we're left with 3.
Fetch the next digit (9) from the dividend, attach it to 3 and continue: 39 / 66

Moving on to step 2:
The number 66 fits into 39 0 times, leaving a remainder of 39.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 39 leaves us with 39.
Include the next digit (0) from the dividend after 39, then repeat: 390 / 66

Moving on to step 3:
66 can be fit into 390 5 times, resulting in a remainder of 60.
The number 5 becomes the next digit in our result. 
Result so far: 5.0
If we subtract 330 from 390, we get 60.
Bring next digit (6) of the dividend behind the 60 and repeat the process: 606 / 66

On to step 4:
66 can be fit into 606 9 times, resulting in a remainder of 12.
The next digit of our result is 9. 
Result so far: 59.0
If we subtract 594 from 606, we get 12.
Include the next digit (4) from the dividend after 12, then repeat: 124 / 66

Going ahead to step 5:
66 goes into 124 1 times with a remainder of 58.
Put 1 as the next digit of the answer. 
Result so far: 591.0
If we take 66 away from 124, we end up with 58.
Bring next digit (1) of the dividend behind the 58 and repeat the process: 581 / 66

Step 6:
581 divided by 66 is 8 with a remainder of 53.
Write down 8 as next digit of the result. 
Result so far: 5918.0
Subtract 528 from 581 to get 53.
Since there are no more digits in the dividend, we add a zero to the remainder making it 530, and continue the process.

Moving on to step 7:
530 divided by 66 is 8 with a remainder of 2.
Use 8 as the next digit of our solution. 
Result so far: 5918.8
If we subtract 528 from 530, 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.

Let's proceed to step 8:
When dividing 20 by 66, we get 0 with a remainder of 20.
Record the quotient 0 as the next digit in the result. 
Result so far: 5918.8
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.
Put 3 as the next digit of the answer. 
Result so far: 5918.803
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.

Let's proceed to step 10:
66 goes into 20 0 times with a remainder of 20.
The next digit of our result is 0. 
Result so far: 5918.803
The remainder is 20 after subtracting 0 from 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Step 11:
66 goes into 200 3 times with a remainder of 2.
Record the quotient 3 as the next digit in the result. 
Result so far: 5918.80303
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 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: 5918.80303
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.

On to step 13:
The number 66 fits into 200 3 times, leaving a remainder of 2.
Use 3 as the next digit of our solution. 
Result so far: 5918.8030303
The remainder is 2 after subtracting 198 from 200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Going ahead to step 14:
20 divided by 66 is 0 with a remainder of 20.
Use 0 as the next digit of our solution. 
Result so far: 5918.8030303
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.

In conclusion, the division gives 5918.8030303 with a balance of 2e-08.