We look at the division of 455891 by 15 
The aim is to understand the frequency of 15 in 455891.

Moving on to step 1:
If we divide 4 by 15, we get 0 and a remainder of 4.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 4, we end up with 4.
Append the next digit (5) from the dividend to 4 and continue with: 45 / 15

Step 2:
If we divide 45 by 15, we get 3 and a remainder of 0.
Use 3 as the next digit of our solution. 
Result so far: 3.0
Subtract 45 from 45 to get 0.
Fetch the next digit (5) from the dividend, attach it to 0 and continue: 5 / 15

Step 3:
The number 15 fits into 5 0 times, leaving a remainder of 5.
The number 0 becomes the next digit in our result. 
Result so far: 30.0
If we take 0 away from 5, we end up with 5.
Take the next digit (8) from the dividend and append it to 5, then repeat: 58 / 15

Going ahead to step 4:
The number 15 fits into 58 3 times, leaving a remainder of 13.
Use 3 as the next digit of our solution. 
Result so far: 303.0
Deduct 45 from 58 and we're left with 13.
Bring next digit (9) of the dividend behind the 13 and repeat the process: 139 / 15

Step 5:
If we divide 139 by 15, we get 9 and a remainder of 4.
Use 9 as the next digit of our solution. 
Result so far: 3039.0
Deduct 135 from 139 and we're left with 4.
Grab the next digit (1) from the dividend, add it to 4, then carry on: 41 / 15

Step 6:
15 goes into 41 2 times with a remainder of 11.
Use 2 as the next digit of our solution. 
Result so far: 30392.0
Subtracting 30 from 41 leaves us with 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Let's proceed to step 7:
15 goes into 110 7 times with a remainder of 5.
Use 7 as the next digit of our solution. 
Result so far: 30392.7
If we subtract 105 from 110, 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.

Moving on to 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: 30392.73
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.

Step 9:
When dividing 50 by 15, we get 3 with a remainder of 5.
Put 3 as the next digit of the answer. 
Result so far: 30392.733
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.

The final outcome is 30392.733, with a leftover of 0.0005.