We look at the division of 21529522 by 215 
We want to figure out the number of times 21529522 can be divided by 215.

Advancing to step 1:
215 goes into 2 0 times with a remainder of 2.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 2 to get 2.
Take the next digit (1) from the dividend and append it to 2, then repeat: 21 / 215

Going ahead to step 2:
When dividing 21 by 215, we get 0 with a remainder of 21.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 21 leaves us with 21.
Grab the next digit (5) from the dividend, add it to 21, then carry on: 215 / 215

Advancing to step 3:
215 goes into 215 1 times with a remainder of 0.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
The remainder is 0 after subtracting 215 from 215.
Take the next digit (2) from the dividend and append it to 0, then repeat: 2 / 215

Going ahead to step 4:
215 goes into 2 0 times with a remainder of 2.
The next digit of our result is 0. 
Result so far: 10.0
Deduct 0 from 2 and we're left with 2.
Fetch the next digit (9) from the dividend, attach it to 2 and continue: 29 / 215

On to step 5:
If we divide 29 by 215, we get 0 and a remainder of 29.
Write down 0 as next digit of the result. 
Result so far: 100.0
If we subtract 0 from 29, we get 29.
Append the next digit (5) from the dividend to 29 and continue with: 295 / 215

Step 6:
295 divided by 215 is 1 with a remainder of 80.
The next digit of our result is 1. 
Result so far: 1001.0
The remainder is 80 after subtracting 215 from 295.
Take the next digit (2) from the dividend and append it to 80, then repeat: 802 / 215

Advancing to step 7:
802 divided by 215 is 3 with a remainder of 157.
The next digit of our result is 3. 
Result so far: 10013.0
If we subtract 645 from 802, we get 157.
Grab the next digit (2) from the dividend, add it to 157, then carry on: 1572 / 215

Step 8:
The number 215 fits into 1572 7 times, leaving a remainder of 67.
The next digit of our result is 7. 
Result so far: 100137.0
If we take 1505 away from 1572, we end up with 67.
Since there are no more digits in the dividend, we add a zero to the remainder making it 670, and continue the process.

Moving on to step 9:
If we divide 670 by 215, we get 3 and a remainder of 25.
The next digit of our result is 3. 
Result so far: 100137.3
Subtracting 645 from 670 leaves us with 25.
Since there are no more digits in the dividend, we add a zero to the remainder making it 250, and continue the process.

On to step 10:
The number 215 fits into 250 1 times, leaving a remainder of 35.
Record the quotient 1 as the next digit in the result. 
Result so far: 100137.31
Deduct 215 from 250 and we're left with 35.
Since there are no more digits in the dividend, we add a zero to the remainder making it 350, and continue the process.

Moving on to step 11:
When dividing 350 by 215, we get 1 with a remainder of 135.
The number 1 becomes the next digit in our result. 
Result so far: 100137.311
Subtract 215 from 350 to get 135.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1350, and continue the process.

After the division, we end up with 100137.311 and a remainder of 0.0135.