Let's divide 15221569 by 915
The aim is to understand the frequency of 915 in 15221569.

Advancing to step 1:
If we divide 1 by 915, we get 0 and a remainder of 1.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 1 to get 1.
Grab the next digit (5) from the dividend, add it to 1, then carry on: 15 / 915

Going ahead to step 2:
If we divide 15 by 915, we get 0 and a remainder of 15.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 15, we get 15.
Take the next digit (2) from the dividend and append it to 15, then repeat: 152 / 915

Moving on to step 3:
915 goes into 152 0 times with a remainder of 152.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 152 leaves us with 152.
Include the next digit (2) from the dividend after 152, then repeat: 1522 / 915

On to step 4:
915 goes into 1522 1 times with a remainder of 607.
Write down 1 as next digit of the result. 
Result so far: 1.0
Subtracting 915 from 1522 leaves us with 607.
Include the next digit (1) from the dividend after 607, then repeat: 6071 / 915

Going ahead to step 5:
The number 915 fits into 6071 6 times, leaving a remainder of 581.
Put 6 as the next digit of the answer. 
Result so far: 16.0
If we subtract 5490 from 6071, we get 581.
Take the next digit (5) from the dividend and append it to 581, then repeat: 5815 / 915

On to step 6:
915 can be fit into 5815 6 times, resulting in a remainder of 325.
Put 6 as the next digit of the answer. 
Result so far: 166.0
If we subtract 5490 from 5815, we get 325.
Include the next digit (6) from the dividend after 325, then repeat: 3256 / 915

Step 7:
If we divide 3256 by 915, we get 3 and a remainder of 511.
Put 3 as the next digit of the answer. 
Result so far: 1663.0
Deduct 2745 from 3256 and we're left with 511.
Take the next digit (9) from the dividend and append it to 511, then repeat: 5119 / 915

Let's proceed to step 8:
915 can be fit into 5119 5 times, resulting in a remainder of 544.
The number 5 becomes the next digit in our result. 
Result so far: 16635.0
If we take 4575 away from 5119, we end up with 544.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5440, and continue the process.

Let's proceed to step 9:
The number 915 fits into 5440 5 times, leaving a remainder of 865.
Record the quotient 5 as the next digit in the result. 
Result so far: 16635.5
Subtract 4575 from 5440 to get 865.
Since there are no more digits in the dividend, we add a zero to the remainder making it 8650, and continue the process.

Step 10:
915 can be fit into 8650 9 times, resulting in a remainder of 415.
The next digit of our result is 9. 
Result so far: 16635.59
If we subtract 8235 from 8650, we get 415.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4150, and continue the process.

Let's proceed to step 11:
4150 divided by 915 is 4 with a remainder of 490.
The number 4 becomes the next digit in our result. 
Result so far: 16635.594
Subtracting 3660 from 4150 leaves us with 490.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4900, and continue the process.

Step 12:
If we divide 4900 by 915, we get 5 and a remainder of 325.
Use 5 as the next digit of our solution. 
Result so far: 16635.5945
Deduct 4575 from 4900 and we're left with 325.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3250, and continue the process.

Moving on to step 13:
When dividing 3250 by 915, we get 3 with a remainder of 505.
The next digit of our result is 3. 
Result so far: 16635.59453
Subtracting 2745 from 3250 leaves us with 505.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5050, and continue the process.

Advancing to step 14:
The number 915 fits into 5050 5 times, leaving a remainder of 475.
Record the quotient 5 as the next digit in the result. 
Result so far: 16635.594535
If we take 4575 away from 5050, we end up with 475.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4750, and continue the process.

On to step 15:
915 can be fit into 4750 5 times, resulting in a remainder of 175.
The next digit of our result is 5. 
Result so far: 16635.5945355
Subtract 4575 from 4750 to get 175.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1750, and continue the process.

Our division results in 16635.5945355 with a remaining 1.75e-06.