We're dividing 833309 by 15 
The aim is to understand the frequency of 15 in 833309.

Step 1:
If we divide 8 by 15, we get 0 and a remainder of 8.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 8 and we're left with 8.
Take the next digit (3) from the dividend and append it to 8, then repeat: 83 / 15

Step 2:
83 divided by 15 is 5 with a remainder of 8.
Put 5 as the next digit of the answer. 
Result so far: 5.0
If we subtract 75 from 83, we get 8.
Bring next digit (3) of the dividend behind the 8 and repeat the process: 83 / 15

Step 3:
83 divided by 15 is 5 with a remainder of 8.
The next digit of our result is 5. 
Result so far: 55.0
Subtract 75 from 83 to get 8.
Bring next digit (3) of the dividend behind the 8 and repeat the process: 83 / 15

Going ahead to step 4:
83 divided by 15 is 5 with a remainder of 8.
Record the quotient 5 as the next digit in the result. 
Result so far: 555.0
If we take 75 away from 83, we end up with 8.
Append the next digit (0) from the dividend to 8 and continue with: 80 / 15

Going ahead to step 5:
15 can be fit into 80 5 times, resulting in a remainder of 5.
The number 5 becomes the next digit in our result. 
Result so far: 5555.0
Subtract 75 from 80 to get 5.
Grab the next digit (9) from the dividend, add it to 5, then carry on: 59 / 15

Step 6:
15 can be fit into 59 3 times, resulting in a remainder of 14.
The number 3 becomes the next digit in our result. 
Result so far: 55553.0
Deduct 45 from 59 and we're left with 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Advancing to step 7:
If we divide 140 by 15, we get 9 and a remainder of 5.
The number 9 becomes the next digit in our result. 
Result so far: 55553.9
Subtract 135 from 140 to get 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Advancing to step 8:
The number 15 fits into 50 3 times, leaving a remainder of 5.
Write down 3 as next digit of the result. 
Result so far: 55553.93
Subtracting 45 from 50 leaves us with 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Moving on to step 9:
15 can be fit into 50 3 times, resulting in a remainder of 5.
Put 3 as the next digit of the answer. 
Result so far: 55553.933
If we take 45 away from 50, we end up with 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Our division results in 55553.933 with a remaining 0.0005.