We look at the division of 401674 by 15 
The aim is to understand the frequency of 15 in 401674.

Going ahead to step 1:
When dividing 4 by 15, we get 0 with a remainder of 4.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 4 after subtracting 0 from 4.
Append the next digit (0) from the dividend to 4 and continue with: 40 / 15

Let's proceed to step 2:
15 goes into 40 2 times with a remainder of 10.
Write down 2 as next digit of the result. 
Result so far: 2.0
Deduct 30 from 40 and we're left with 10.
Fetch the next digit (1) from the dividend, attach it to 10 and continue: 101 / 15

Going ahead to step 3:
15 can be fit into 101 6 times, resulting in a remainder of 11.
The number 6 becomes the next digit in our result. 
Result so far: 26.0
If we take 90 away from 101, we end up with 11.
Include the next digit (6) from the dividend after 11, then repeat: 116 / 15

On to step 4:
15 goes into 116 7 times with a remainder of 11.
The next digit of our result is 7. 
Result so far: 267.0
Subtract 105 from 116 to get 11.
Take the next digit (7) from the dividend and append it to 11, then repeat: 117 / 15

On to step 5:
117 divided by 15 is 7 with a remainder of 12.
The number 7 becomes the next digit in our result. 
Result so far: 2677.0
If we take 105 away from 117, we end up with 12.
Grab the next digit (4) from the dividend, add it to 12, then carry on: 124 / 15

Step 6:
15 goes into 124 8 times with a remainder of 4.
Record the quotient 8 as the next digit in the result. 
Result so far: 26778.0
If we take 120 away from 124, 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.

Moving on to step 7:
15 goes into 40 2 times with a remainder of 10.
Use 2 as the next digit of our solution. 
Result so far: 26778.2
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.

Advancing to step 8:
The number 15 fits into 100 6 times, leaving a remainder of 10.
The next digit of our result is 6. 
Result so far: 26778.26
Deduct 90 from 100 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 9:
When dividing 100 by 15, we get 6 with a remainder of 10.
Use 6 as the next digit of our solution. 
Result so far: 26778.266
Subtracting 90 from 100 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.

Our division results in 26778.266 with a remaining 0.001.