371499 ÷ 15 
The aim is to understand the frequency of 15 in 371499.

Step 1:
When dividing 3 by 15, we get 0 with a remainder of 3.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 3, we get 3.
Append the next digit (7) from the dividend to 3 and continue with: 37 / 15

Moving on to step 2:
15 goes into 37 2 times with a remainder of 7.
Use 2 as the next digit of our solution. 
Result so far: 2.0
Deduct 30 from 37 and we're left with 7.
Bring next digit (1) of the dividend behind the 7 and repeat the process: 71 / 15

Step 3:
15 can be fit into 71 4 times, resulting in a remainder of 11.
The next digit of our result is 4. 
Result so far: 24.0
Subtracting 60 from 71 leaves us with 11.
Grab the next digit (4) from the dividend, add it to 11, then carry on: 114 / 15

Advancing to step 4:
114 divided by 15 is 7 with a remainder of 9.
Put 7 as the next digit of the answer. 
Result so far: 247.0
If we subtract 105 from 114, we get 9.
Take the next digit (9) from the dividend and append it to 9, then repeat: 99 / 15

Advancing to step 5:
15 can be fit into 99 6 times, resulting in a remainder of 9.
Use 6 as the next digit of our solution. 
Result so far: 2476.0
The remainder is 9 after subtracting 90 from 99.
Grab the next digit (9) from the dividend, add it to 9, then carry on: 99 / 15

Going ahead to step 6:
If we divide 99 by 15, we get 6 and a remainder of 9.
Use 6 as the next digit of our solution. 
Result so far: 24766.0
If we take 90 away from 99, we end up with 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Let's proceed to step 7:
15 goes into 90 6 times with a remainder of 0.
Write down 6 as next digit of the result. 
Result so far: 24766.6
Deduct 90 from 90 and we're left with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Moving on to step 8:
When dividing 0 by 15, we get 0 with a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 24766.6
Subtracting 0 from 0 leaves us with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Step 9:
15 can be fit into 0 0 times, resulting in a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 24766.6
The remainder is 0 after subtracting 0 from 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

The final outcome is 24766.6, with a leftover of 0.0.