133909 ÷ 15 
We want to figure out the number of times 133909 can be divided by 15.

Going ahead to step 1:
15 goes into 1 0 times with a remainder of 1.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 1, we get 1.
Append the next digit (3) from the dividend to 1 and continue with: 13 / 15

Moving on to step 2:
13 divided by 15 is 0 with a remainder of 13.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 13 after subtracting 0 from 13.
Take the next digit (3) from the dividend and append it to 13, then repeat: 133 / 15

On to step 3:
15 goes into 133 8 times with a remainder of 13.
Put 8 as the next digit of the answer. 
Result so far: 8.0
If we subtract 120 from 133, we get 13.
Bring next digit (9) of the dividend behind the 13 and repeat the process: 139 / 15

Advancing to step 4:
If we divide 139 by 15, we get 9 and a remainder of 4.
Record the quotient 9 as the next digit in the result. 
Result so far: 89.0
If we take 135 away from 139, we end up with 4.
Fetch the next digit (0) from the dividend, attach it to 4 and continue: 40 / 15

Moving on to step 5:
When dividing 40 by 15, we get 2 with a remainder of 10.
The next digit of our result is 2. 
Result so far: 892.0
Subtracting 30 from 40 leaves us with 10.
Grab the next digit (9) from the dividend, add it to 10, then carry on: 109 / 15

On to step 6:
The number 15 fits into 109 7 times, leaving a remainder of 4.
The number 7 becomes the next digit in our result. 
Result so far: 8927.0
If we take 105 away from 109, we end up with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

On to step 7:
40 divided by 15 is 2 with a remainder of 10.
Use 2 as the next digit of our solution. 
Result so far: 8927.2
Deduct 30 from 40 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.

Moving on to step 8:
15 can be fit into 100 6 times, resulting in a remainder of 10.
Write down 6 as next digit of the result. 
Result so far: 8927.26
If we subtract 90 from 100, we get 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 9:
15 goes into 100 6 times with a remainder of 10.
Record the quotient 6 as the next digit in the result. 
Result so far: 8927.266
The remainder is 10 after subtracting 90 from 100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

In conclusion, the division gives 8927.266 with a balance of 0.001.