We look at the division of 31115356 by 15 
The aim is to understand the frequency of 15 in 31115356.

Let's proceed to step 1:
The number 15 fits into 3 0 times, leaving a remainder of 3.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 3 and we're left with 3.
Take the next digit (1) from the dividend and append it to 3, then repeat: 31 / 15

Step 2:
If we divide 31 by 15, we get 2 and a remainder of 1.
The number 2 becomes the next digit in our result. 
Result so far: 2.0
Subtracting 30 from 31 leaves us with 1.
Append the next digit (1) from the dividend to 1 and continue with: 11 / 15

Advancing to step 3:
15 can be fit into 11 0 times, resulting in a remainder of 11.
Put 0 as the next digit of the answer. 
Result so far: 20.0
If we take 0 away from 11, we end up with 11.
Append the next digit (1) from the dividend to 11 and continue with: 111 / 15

Let's proceed to step 4:
15 goes into 111 7 times with a remainder of 6.
Put 7 as the next digit of the answer. 
Result so far: 207.0
The remainder is 6 after subtracting 105 from 111.
Bring next digit (5) of the dividend behind the 6 and repeat the process: 65 / 15

Moving on to step 5:
15 goes into 65 4 times with a remainder of 5.
Use 4 as the next digit of our solution. 
Result so far: 2074.0
Subtract 60 from 65 to get 5.
Take the next digit (3) from the dividend and append it to 5, then repeat: 53 / 15

Step 6:
15 goes into 53 3 times with a remainder of 8.
Record the quotient 3 as the next digit in the result. 
Result so far: 20743.0
Deduct 45 from 53 and we're left with 8.
Grab the next digit (5) from the dividend, add it to 8, then carry on: 85 / 15

On to step 7:
When dividing 85 by 15, we get 5 with a remainder of 10.
Use 5 as the next digit of our solution. 
Result so far: 207435.0
Subtracting 75 from 85 leaves us with 10.
Grab the next digit (6) from the dividend, add it to 10, then carry on: 106 / 15

Let's proceed to step 8:
When dividing 106 by 15, we get 7 with a remainder of 1.
Use 7 as the next digit of our solution. 
Result so far: 2074357.0
Deduct 105 from 106 and we're left with 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

On to step 9:
15 goes into 10 0 times with a remainder of 10.
Use 0 as the next digit of our solution. 
Result so far: 2074357.0
Subtracting 0 from 10 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.

Moving on to step 10:
When dividing 100 by 15, we get 6 with a remainder of 10.
The next digit of our result is 6. 
Result so far: 2074357.06
If we subtract 90 from 100, we 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.

Going ahead to step 11:
15 goes into 100 6 times with a remainder of 10.
Record the quotient 6 as the next digit in the result. 
Result so far: 2074357.066
Deduct 90 from 100 and we're left 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.

In conclusion, the division gives 2074357.066 with a balance of 0.001.