We divide 15326961 by 15
The aim is to understand the frequency of 15 in 15326961.

On to step 1:
When dividing 1 by 15, we get 0 with a remainder of 1.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 1 to get 1.
Bring next digit (5) of the dividend behind the 1 and repeat the process: 15 / 15

On to step 2:
15 goes into 15 1 times with a remainder of 0.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
The remainder is 0 after subtracting 15 from 15.
Include the next digit (3) from the dividend after 0, then repeat: 3 / 15

Moving on to step 3:
15 can be fit into 3 0 times, resulting in a remainder of 3.
Use 0 as the next digit of our solution. 
Result so far: 10.0
Deduct 0 from 3 and we're left with 3.
Grab the next digit (2) from the dividend, add it to 3, then carry on: 32 / 15

Step 4:
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: 102.0
Deduct 30 from 32 and we're left with 2.
Bring next digit (6) of the dividend behind the 2 and repeat the process: 26 / 15

On to step 5:
When dividing 26 by 15, we get 1 with a remainder of 11.
The next digit of our result is 1. 
Result so far: 1021.0
If we take 15 away from 26, we end up with 11.
Bring next digit (9) of the dividend behind the 11 and repeat the process: 119 / 15

On to step 6:
The number 15 fits into 119 7 times, leaving a remainder of 14.
Put 7 as the next digit of the answer. 
Result so far: 10217.0
Subtracting 105 from 119 leaves us with 14.
Include the next digit (6) from the dividend after 14, then repeat: 146 / 15

Advancing to step 7:
15 can be fit into 146 9 times, resulting in a remainder of 11.
The number 9 becomes the next digit in our result. 
Result so far: 102179.0
If we take 135 away from 146, we end up with 11.
Grab the next digit (1) from the dividend, add it to 11, then carry on: 111 / 15

Moving on to step 8:
If we divide 111 by 15, we get 7 and a remainder of 6.
The next digit of our result is 7. 
Result so far: 1021797.0
Deduct 105 from 111 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:
15 can be fit into 60 4 times, resulting in a remainder of 0.
Record the quotient 4 as the next digit in the result. 
Result so far: 1021797.4
Subtracting 60 from 60 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.

Let's proceed to step 10:
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: 1021797.4
Subtract 0 from 0 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.

Moving on to step 11:
If we divide 0 by 15, we get 0 and a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 1021797.4
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.

The final outcome is 1021797.4, with a leftover of 0.0.