816704 ÷ 15 
The aim is to understand the frequency of 15 in 816704.

On to step 1:
15 can be fit into 8 0 times, resulting in a remainder of 8.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 8 to get 8.
Include the next digit (1) from the dividend after 8, then repeat: 81 / 15

On to step 2:
15 can be fit into 81 5 times, resulting in a remainder of 6.
Write down 5 as next digit of the result. 
Result so far: 5.0
Deduct 75 from 81 and we're left with 6.
Include the next digit (6) from the dividend after 6, then repeat: 66 / 15

Going ahead to step 3:
When dividing 66 by 15, we get 4 with a remainder of 6.
The next digit of our result is 4. 
Result so far: 54.0
If we take 60 away from 66, we end up with 6.
Grab the next digit (7) from the dividend, add it to 6, then carry on: 67 / 15

Moving on to step 4:
When dividing 67 by 15, we get 4 with a remainder of 7.
The next digit of our result is 4. 
Result so far: 544.0
Deduct 60 from 67 and we're left with 7.
Append the next digit (0) from the dividend to 7 and continue with: 70 / 15

Step 5:
15 goes into 70 4 times with a remainder of 10.
Record the quotient 4 as the next digit in the result. 
Result so far: 5444.0
Subtract 60 from 70 to get 10.
Bring next digit (4) of the dividend behind the 10 and repeat the process: 104 / 15

Step 6:
15 goes into 104 6 times with a remainder of 14.
The number 6 becomes the next digit in our result. 
Result so far: 54446.0
Deduct 90 from 104 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.

Moving on to step 7:
15 goes into 140 9 times with a remainder of 5.
Write down 9 as next digit of the result. 
Result so far: 54446.9
If we subtract 135 from 140, we 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.

Step 8:
If we divide 50 by 15, we get 3 and a remainder of 5.
Put 3 as the next digit of the answer. 
Result so far: 54446.93
Subtract 45 from 50 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.

Going ahead 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: 54446.933
If we subtract 45 from 50, we 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.

Our division results in 54446.933 with a remaining 0.0005.