We're dividing 66867324 by 15 
The aim is to understand the frequency of 15 in 66867324.

Moving on to step 1:
The number 15 fits into 6 0 times, leaving a remainder of 6.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 6, we get 6.
Fetch the next digit (6) from the dividend, attach it to 6 and continue: 66 / 15

Let's proceed to step 2:
When dividing 66 by 15, we get 4 with a remainder of 6.
Put 4 as the next digit of the answer. 
Result so far: 4.0
If we subtract 60 from 66, we get 6.
Grab the next digit (8) from the dividend, add it to 6, then carry on: 68 / 15

On to step 3:
15 can be fit into 68 4 times, resulting in a remainder of 8.
Record the quotient 4 as the next digit in the result. 
Result so far: 44.0
The remainder is 8 after subtracting 60 from 68.
Take the next digit (6) from the dividend and append it to 8, then repeat: 86 / 15

Going ahead to step 4:
If we divide 86 by 15, we get 5 and a remainder of 11.
Record the quotient 5 as the next digit in the result. 
Result so far: 445.0
Deduct 75 from 86 and we're left with 11.
Grab the next digit (7) from the dividend, add it to 11, then carry on: 117 / 15

Advancing to step 5:
If we divide 117 by 15, we get 7 and a remainder of 12.
The number 7 becomes the next digit in our result. 
Result so far: 4457.0
If we take 105 away from 117, we end up with 12.
Bring next digit (3) of the dividend behind the 12 and repeat the process: 123 / 15

Going ahead to step 6:
When dividing 123 by 15, we get 8 with a remainder of 3.
The next digit of our result is 8. 
Result so far: 44578.0
Deduct 120 from 123 and we're left with 3.
Append the next digit (2) from the dividend to 3 and continue with: 32 / 15

Moving on to step 7:
15 goes into 32 2 times with a remainder of 2.
Record the quotient 2 as the next digit in the result. 
Result so far: 445782.0
If we take 30 away from 32, we end up with 2.
Append the next digit (4) from the dividend to 2 and continue with: 24 / 15

Advancing to step 8:
24 divided by 15 is 1 with a remainder of 9.
Write down 1 as next digit of the result. 
Result so far: 4457821.0
Subtracting 15 from 24 leaves us 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.

Advancing to step 9:
15 goes into 90 6 times with a remainder of 0.
Put 6 as the next digit of the answer. 
Result so far: 4457821.6
Subtract 90 from 90 to 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.

Advancing to step 10:
If we divide 0 by 15, we get 0 and a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 4457821.6
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.

Advancing to step 11:
When dividing 0 by 15, we get 0 with a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 4457821.6
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.

After the division, we end up with 4457821.6 and a remainder of 0.0.