Let's divide 855343 by 15
The aim is to understand the frequency of 15 in 855343.

Let's proceed to step 1:
8 divided by 15 is 0 with a remainder of 8.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 8, we end up with 8.
Include the next digit (5) from the dividend after 8, then repeat: 85 / 15

Moving on to step 2:
The number 15 fits into 85 5 times, leaving a remainder of 10.
Use 5 as the next digit of our solution. 
Result so far: 5.0
Subtracting 75 from 85 leaves us with 10.
Grab the next digit (5) from the dividend, add it to 10, then carry on: 105 / 15

On to step 3:
If we divide 105 by 15, we get 7 and a remainder of 0.
Put 7 as the next digit of the answer. 
Result so far: 57.0
If we take 105 away from 105, we end up with 0.
Append the next digit (3) from the dividend to 0 and continue with: 3 / 15

Moving on to step 4:
When dividing 3 by 15, we get 0 with a remainder of 3.
The number 0 becomes the next digit in our result. 
Result so far: 570.0
Deduct 0 from 3 and we're left with 3.
Fetch the next digit (4) from the dividend, attach it to 3 and continue: 34 / 15

Going ahead to step 5:
The number 15 fits into 34 2 times, leaving a remainder of 4.
The number 2 becomes the next digit in our result. 
Result so far: 5702.0
The remainder is 4 after subtracting 30 from 34.
Take the next digit (3) from the dividend and append it to 4, then repeat: 43 / 15

Going ahead to step 6:
15 goes into 43 2 times with a remainder of 13.
The number 2 becomes the next digit in our result. 
Result so far: 57022.0
Deduct 30 from 43 and we're left with 13.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

Step 7:
15 can be fit into 130 8 times, resulting in a remainder of 10.
The number 8 becomes the next digit in our result. 
Result so far: 57022.8
Subtracting 120 from 130 leaves us 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.

On to step 8:
100 divided by 15 is 6 with a remainder of 10.
Record the quotient 6 as the next digit in the result. 
Result so far: 57022.86
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.

Moving on to step 9:
100 divided by 15 is 6 with a remainder of 10.
Put 6 as the next digit of the answer. 
Result so far: 57022.866
Subtract 90 from 100 to 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.

The quotient of the division is 57022.866, and the remainder is 0.001.