Let's divide 15257997 by 915
The aim is to understand the frequency of 915 in 15257997.

On to step 1:
The number 915 fits into 1 0 times, leaving a remainder of 1.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 1 leaves us with 1.
Bring next digit (5) of the dividend behind the 1 and repeat the process: 15 / 915

On to step 2:
915 goes into 15 0 times with a remainder of 15.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 15 after subtracting 0 from 15.
Append the next digit (2) from the dividend to 15 and continue with: 152 / 915

Going ahead to step 3:
The number 915 fits into 152 0 times, leaving a remainder of 152.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 152, we get 152.
Take the next digit (5) from the dividend and append it to 152, then repeat: 1525 / 915

On to step 4:
915 goes into 1525 1 times with a remainder of 610.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
Subtract 915 from 1525 to get 610.
Fetch the next digit (7) from the dividend, attach it to 610 and continue: 6107 / 915

Going ahead to step 5:
If we divide 6107 by 915, we get 6 and a remainder of 617.
The number 6 becomes the next digit in our result. 
Result so far: 16.0
Subtract 5490 from 6107 to get 617.
Include the next digit (9) from the dividend after 617, then repeat: 6179 / 915

Step 6:
The number 915 fits into 6179 6 times, leaving a remainder of 689.
Write down 6 as next digit of the result. 
Result so far: 166.0
If we take 5490 away from 6179, we end up with 689.
Append the next digit (9) from the dividend to 689 and continue with: 6899 / 915

Moving on to step 7:
If we divide 6899 by 915, we get 7 and a remainder of 494.
Put 7 as the next digit of the answer. 
Result so far: 1667.0
Subtract 6405 from 6899 to get 494.
Grab the next digit (7) from the dividend, add it to 494, then carry on: 4947 / 915

On to step 8:
915 can be fit into 4947 5 times, resulting in a remainder of 372.
Put 5 as the next digit of the answer. 
Result so far: 16675.0
The remainder is 372 after subtracting 4575 from 4947.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3720, and continue the process.

Let's proceed to step 9:
When dividing 3720 by 915, we get 4 with a remainder of 60.
The number 4 becomes the next digit in our result. 
Result so far: 16675.4
If we subtract 3660 from 3720, we get 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Advancing to step 10:
If we divide 600 by 915, we get 0 and a remainder of 600.
The next digit of our result is 0. 
Result so far: 16675.4
Subtract 0 from 600 to get 600.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6000, and continue the process.

On to step 11:
915 goes into 6000 6 times with a remainder of 510.
The number 6 becomes the next digit in our result. 
Result so far: 16675.406
Subtract 5490 from 6000 to get 510.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5100, and continue the process.

Let's proceed to step 12:
915 goes into 5100 5 times with a remainder of 525.
Put 5 as the next digit of the answer. 
Result so far: 16675.4065
Deduct 4575 from 5100 and we're left with 525.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5250, and continue the process.

Going ahead to step 13:
915 goes into 5250 5 times with a remainder of 675.
The next digit of our result is 5. 
Result so far: 16675.40655
Subtracting 4575 from 5250 leaves us with 675.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6750, and continue the process.

The final result is 16675.40655 with a remainder of 0.000675.