438119 ÷ 15 
The aim is to understand the frequency of 15 in 438119.

Moving on to step 1:
4 divided by 15 is 0 with a remainder of 4.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 4, we get 4.
Fetch the next digit (3) from the dividend, attach it to 4 and continue: 43 / 15

On to step 2:
When dividing 43 by 15, we get 2 with a remainder of 13.
Write down 2 as next digit of the result. 
Result so far: 2.0
Subtracting 30 from 43 leaves us with 13.
Fetch the next digit (8) from the dividend, attach it to 13 and continue: 138 / 15

Advancing to step 3:
The number 15 fits into 138 9 times, leaving a remainder of 3.
Put 9 as the next digit of the answer. 
Result so far: 29.0
The remainder is 3 after subtracting 135 from 138.
Include the next digit (1) from the dividend after 3, then repeat: 31 / 15

Step 4:
15 can be fit into 31 2 times, resulting in a remainder of 1.
The number 2 becomes the next digit in our result. 
Result so far: 292.0
Subtract 30 from 31 to get 1.
Grab the next digit (1) from the dividend, add it to 1, then carry on: 11 / 15

Step 5:
If we divide 11 by 15, we get 0 and a remainder of 11.
Put 0 as the next digit of the answer. 
Result so far: 2920.0
If we take 0 away from 11, we end up with 11.
Bring next digit (9) of the dividend behind the 11 and repeat the process: 119 / 15

Moving on to step 6:
The number 15 fits into 119 7 times, leaving a remainder of 14.
Use 7 as the next digit of our solution. 
Result so far: 29207.0
Subtracting 105 from 119 leaves us 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.

On to step 7:
If we divide 140 by 15, we get 9 and a remainder of 5.
Use 9 as the next digit of our solution. 
Result so far: 29207.9
If we take 135 away from 140, 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.

Advancing to step 8:
The number 15 fits into 50 3 times, leaving a remainder of 5.
The next digit of our result is 3. 
Result so far: 29207.93
Subtracting 45 from 50 leaves us 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:
The number 15 fits into 50 3 times, leaving a remainder of 5.
The next digit of our result is 3. 
Result so far: 29207.933
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.

After the division, we end up with 29207.933 and a remainder of 0.0005.