978229 ÷ 15 
The aim is to understand the frequency of 15 in 978229.

Moving on to step 1:
9 divided by 15 is 0 with a remainder of 9.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 9, we get 9.
Grab the next digit (7) from the dividend, add it to 9, then carry on: 97 / 15

Advancing to step 2:
15 can be fit into 97 6 times, resulting in a remainder of 7.
Write down 6 as next digit of the result. 
Result so far: 6.0
If we take 90 away from 97, we end up with 7.
Append the next digit (8) from the dividend to 7 and continue with: 78 / 15

Step 3:
78 divided by 15 is 5 with a remainder of 3.
Record the quotient 5 as the next digit in the result. 
Result so far: 65.0
If we subtract 75 from 78, we get 3.
Include the next digit (2) from the dividend after 3, then repeat: 32 / 15

Advancing to step 4:
32 divided by 15 is 2 with a remainder of 2.
Write down 2 as next digit of the result. 
Result so far: 652.0
Subtracting 30 from 32 leaves us with 2.
Bring next digit (2) of the dividend behind the 2 and repeat the process: 22 / 15

Let's proceed to step 5:
If we divide 22 by 15, we get 1 and a remainder of 7.
The number 1 becomes the next digit in our result. 
Result so far: 6521.0
If we take 15 away from 22, we end up with 7.
Grab the next digit (9) from the dividend, add it to 7, then carry on: 79 / 15

Step 6:
15 goes into 79 5 times with a remainder of 4.
The next digit of our result is 5. 
Result so far: 65215.0
If we take 75 away from 79, 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 can be fit into 40 2 times, resulting in a remainder of 10.
Record the quotient 2 as the next digit in the result. 
Result so far: 65215.2
Subtracting 30 from 40 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.

Going ahead 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: 65215.26
If we take 90 away from 100, we end up 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.

Step 9:
When dividing 100 by 15, we get 6 with a remainder of 10.
Put 6 as the next digit of the answer. 
Result so far: 65215.266
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 65215.266, and the remainder is 0.001.