1525986 ÷ 215 
The aim is to understand the frequency of 215 in 1525986.

Let's proceed to step 1:
215 goes into 1 0 times with a remainder of 1.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 1 after subtracting 0 from 1.
Take the next digit (5) from the dividend and append it to 1, then repeat: 15 / 215

Step 2:
If we divide 15 by 215, we get 0 and a remainder of 15.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 15 after subtracting 0 from 15.
Include the next digit (2) from the dividend after 15, then repeat: 152 / 215

Moving on to step 3:
152 divided by 215 is 0 with a remainder of 152.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 152 to get 152.
Grab the next digit (5) from the dividend, add it to 152, then carry on: 1525 / 215

Moving on to step 4:
If we divide 1525 by 215, we get 7 and a remainder of 20.
Put 7 as the next digit of the answer. 
Result so far: 7.0
Deduct 1505 from 1525 and we're left with 20.
Grab the next digit (9) from the dividend, add it to 20, then carry on: 209 / 215

On to step 5:
215 can be fit into 209 0 times, resulting in a remainder of 209.
Write down 0 as next digit of the result. 
Result so far: 70.0
If we subtract 0 from 209, we get 209.
Grab the next digit (8) from the dividend, add it to 209, then carry on: 2098 / 215

Advancing to step 6:
When dividing 2098 by 215, we get 9 with a remainder of 163.
Put 9 as the next digit of the answer. 
Result so far: 709.0
If we take 1935 away from 2098, we end up with 163.
Bring next digit (6) of the dividend behind the 163 and repeat the process: 1636 / 215

Going ahead to step 7:
215 goes into 1636 7 times with a remainder of 131.
Write down 7 as next digit of the result. 
Result so far: 7097.0
Deduct 1505 from 1636 and we're left with 131.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1310, and continue the process.

Going ahead to step 8:
When dividing 1310 by 215, we get 6 with a remainder of 20.
Write down 6 as next digit of the result. 
Result so far: 7097.6
If we take 1290 away from 1310, we end up with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Moving on to step 9:
If we divide 200 by 215, we get 0 and a remainder of 200.
Write down 0 as next digit of the result. 
Result so far: 7097.6
If we take 0 away from 200, we end up with 200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2000, and continue the process.

Going ahead to step 10:
The number 215 fits into 2000 9 times, leaving a remainder of 65.
Put 9 as the next digit of the answer. 
Result so far: 7097.609
If we subtract 1935 from 2000, we get 65.
Since there are no more digits in the dividend, we add a zero to the remainder making it 650, and continue the process.

Going ahead to step 11:
215 goes into 650 3 times with a remainder of 5.
The next digit of our result is 3. 
Result so far: 7097.6093
Subtracting 645 from 650 leaves us with 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Going ahead to step 12:
215 can be fit into 50 0 times, resulting in a remainder of 50.
Record the quotient 0 as the next digit in the result. 
Result so far: 7097.6093
Deduct 0 from 50 and we're left with 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

Step 13:
When dividing 500 by 215, we get 2 with a remainder of 70.
Write down 2 as next digit of the result. 
Result so far: 7097.609302
Subtract 430 from 500 to get 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 700, and continue the process.

Let's proceed to step 14:
215 can be fit into 700 3 times, resulting in a remainder of 55.
The number 3 becomes the next digit in our result. 
Result so far: 7097.6093023
Subtracting 645 from 700 leaves us with 55.
Since there are no more digits in the dividend, we add a zero to the remainder making it 550, and continue the process.

Advancing to step 15:
550 divided by 215 is 2 with a remainder of 120.
Write down 2 as next digit of the result. 
Result so far: 7097.60930232
The remainder is 120 after subtracting 430 from 550.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1200, and continue the process.

The final result is 7097.60930232 with a remainder of 1.2e-07.