We look at the division of 139959 by 66 
Let's see how many times 66 fits into 139959.

Let's proceed to step 1:
1 divided by 66 is 0 with a remainder of 1.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 1 after subtracting 0 from 1.
Append the next digit (3) from the dividend to 1 and continue with: 13 / 66

On to step 2:
13 divided by 66 is 0 with a remainder of 13.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 13 and we're left with 13.
Include the next digit (9) from the dividend after 13, then repeat: 139 / 66

On to step 3:
When dividing 139 by 66, we get 2 with a remainder of 7.
Use 2 as the next digit of our solution. 
Result so far: 2.0
Subtracting 132 from 139 leaves us with 7.
Append the next digit (9) from the dividend to 7 and continue with: 79 / 66

On to step 4:
66 goes into 79 1 times with a remainder of 13.
Put 1 as the next digit of the answer. 
Result so far: 21.0
Subtracting 66 from 79 leaves us with 13.
Take the next digit (5) from the dividend and append it to 13, then repeat: 135 / 66

Moving on to step 5:
When dividing 135 by 66, we get 2 with a remainder of 3.
The number 2 becomes the next digit in our result. 
Result so far: 212.0
Subtracting 132 from 135 leaves us with 3.
Append the next digit (9) from the dividend to 3 and continue with: 39 / 66

Step 6:
39 divided by 66 is 0 with a remainder of 39.
Put 0 as the next digit of the answer. 
Result so far: 2120.0
If we take 0 away from 39, we end up with 39.
Since there are no more digits in the dividend, we add a zero to the remainder making it 390, and continue the process.

On to step 7:
If we divide 390 by 66, we get 5 and a remainder of 60.
Use 5 as the next digit of our solution. 
Result so far: 2120.5
Subtracting 330 from 390 leaves us with 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Going ahead to step 8:
The number 66 fits into 600 9 times, leaving a remainder of 6.
Use 9 as the next digit of our solution. 
Result so far: 2120.59
Subtract 594 from 600 to get 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Moving on to step 9:
If we divide 60 by 66, we get 0 and a remainder of 60.
Write down 0 as next digit of the result. 
Result so far: 2120.59
The remainder is 60 after subtracting 0 from 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Let's proceed to step 10:
When dividing 600 by 66, we get 9 with a remainder of 6.
Write down 9 as next digit of the result. 
Result so far: 2120.5909
Subtract 594 from 600 to get 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Step 11:
If we divide 60 by 66, we get 0 and a remainder of 60.
The next digit of our result is 0. 
Result so far: 2120.5909
Deduct 0 from 60 and we're left with 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Step 12:
If we divide 600 by 66, we get 9 and a remainder of 6.
The next digit of our result is 9. 
Result so far: 2120.590909
The remainder is 6 after subtracting 594 from 600.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Going ahead to step 13:
66 can be fit into 60 0 times, resulting in a remainder of 60.
Write down 0 as next digit of the result. 
Result so far: 2120.590909
Subtract 0 from 60 to get 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Moving on to step 14:
If we divide 600 by 66, we get 9 and a remainder of 6.
The number 9 becomes the next digit in our result. 
Result so far: 2120.59090909
Subtract 594 from 600 to get 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

In conclusion, the division gives 2120.59090909 with a balance of 6e-09.