We look at the division of 29679816 by 15 
The aim is to understand the frequency of 15 in 29679816.

Going ahead to step 1:
2 divided by 15 is 0 with a remainder of 2.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 2 to get 2.
Include the next digit (9) from the dividend after 2, then repeat: 29 / 15

Let's proceed to step 2:
If we divide 29 by 15, we get 1 and a remainder of 14.
The next digit of our result is 1. 
Result so far: 1.0
Subtracting 15 from 29 leaves us with 14.
Fetch the next digit (6) from the dividend, attach it to 14 and continue: 146 / 15

Going ahead to step 3:
15 can be fit into 146 9 times, resulting in a remainder of 11.
Write down 9 as next digit of the result. 
Result so far: 19.0
Subtract 135 from 146 to get 11.
Take the next digit (7) from the dividend and append it to 11, then repeat: 117 / 15

On to step 4:
The number 15 fits into 117 7 times, leaving a remainder of 12.
Put 7 as the next digit of the answer. 
Result so far: 197.0
Subtracting 105 from 117 leaves us with 12.
Bring next digit (9) of the dividend behind the 12 and repeat the process: 129 / 15

On to step 5:
The number 15 fits into 129 8 times, leaving a remainder of 9.
Use 8 as the next digit of our solution. 
Result so far: 1978.0
Subtracting 120 from 129 leaves us with 9.
Append the next digit (8) from the dividend to 9 and continue with: 98 / 15

Let's proceed to step 6:
98 divided by 15 is 6 with a remainder of 8.
The next digit of our result is 6. 
Result so far: 19786.0
If we take 90 away from 98, we end up with 8.
Take the next digit (1) from the dividend and append it to 8, then repeat: 81 / 15

Advancing to step 7:
15 goes into 81 5 times with a remainder of 6.
The next digit of our result is 5. 
Result so far: 197865.0
Subtract 75 from 81 to get 6.
Grab the next digit (6) from the dividend, add it to 6, then carry on: 66 / 15

Let's proceed to step 8:
If we divide 66 by 15, we get 4 and a remainder of 6.
Put 4 as the next digit of the answer. 
Result so far: 1978654.0
Deduct 60 from 66 and we're left with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Advancing to step 9:
The number 15 fits into 60 4 times, leaving a remainder of 0.
The number 4 becomes the next digit in our result. 
Result so far: 1978654.4
Deduct 60 from 60 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.

Let's proceed to step 10:
15 goes into 0 0 times with a remainder of 0.
The next digit of our result is 0. 
Result so far: 1978654.4
If we take 0 away from 0, we end up 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.

Let's proceed to step 11:
15 goes into 0 0 times with a remainder of 0.
The next digit of our result is 0. 
Result so far: 1978654.4
If we subtract 0 from 0, we get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Our division results in 1978654.4 with a remaining 0.0.