15416091 ÷ 215 
The aim is to understand the frequency of 215 in 15416091.

Moving on to step 1:
The number 215 fits into 1 0 times, leaving a remainder of 1.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 1 after subtracting 0 from 1.
Include the next digit (5) from the dividend after 1, then repeat: 15 / 215

On to step 2:
If we divide 15 by 215, we get 0 and a remainder of 15.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 15 to get 15.
Fetch the next digit (4) from the dividend, attach it to 15 and continue: 154 / 215

Going ahead to step 3:
The number 215 fits into 154 0 times, leaving a remainder of 154.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 154 leaves us with 154.
Grab the next digit (1) from the dividend, add it to 154, then carry on: 1541 / 215

Step 4:
215 can be fit into 1541 7 times, resulting in a remainder of 36.
Write down 7 as next digit of the result. 
Result so far: 7.0
If we subtract 1505 from 1541, we get 36.
Take the next digit (6) from the dividend and append it to 36, then repeat: 366 / 215

Moving on to step 5:
215 can be fit into 366 1 times, resulting in a remainder of 151.
Write down 1 as next digit of the result. 
Result so far: 71.0
Deduct 215 from 366 and we're left with 151.
Append the next digit (0) from the dividend to 151 and continue with: 1510 / 215

Moving on to step 6:
The number 215 fits into 1510 7 times, leaving a remainder of 5.
Record the quotient 7 as the next digit in the result. 
Result so far: 717.0
Subtracting 1505 from 1510 leaves us with 5.
Bring next digit (9) of the dividend behind the 5 and repeat the process: 59 / 215

Advancing to step 7:
When dividing 59 by 215, we get 0 with a remainder of 59.
Use 0 as the next digit of our solution. 
Result so far: 7170.0
Subtract 0 from 59 to get 59.
Bring next digit (1) of the dividend behind the 59 and repeat the process: 591 / 215

On to step 8:
If we divide 591 by 215, we get 2 and a remainder of 161.
The number 2 becomes the next digit in our result. 
Result so far: 71702.0
Subtract 430 from 591 to get 161.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1610, and continue the process.

On to step 9:
215 can be fit into 1610 7 times, resulting in a remainder of 105.
Put 7 as the next digit of the answer. 
Result so far: 71702.7
If we subtract 1505 from 1610, we get 105.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1050, and continue the process.

Let's proceed to step 10:
215 can be fit into 1050 4 times, resulting in a remainder of 190.
Use 4 as the next digit of our solution. 
Result so far: 71702.74
Deduct 860 from 1050 and we're left with 190.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1900, and continue the process.

Step 11:
If we divide 1900 by 215, we get 8 and a remainder of 180.
Write down 8 as next digit of the result. 
Result so far: 71702.748
The remainder is 180 after subtracting 1720 from 1900.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1800, and continue the process.

Step 12:
The number 215 fits into 1800 8 times, leaving a remainder of 80.
Record the quotient 8 as the next digit in the result. 
Result so far: 71702.7488
If we subtract 1720 from 1800, we get 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

In conclusion, the division gives 71702.7488 with a balance of 0.0008.