We're dividing 21072853 by 515 
We're looking to find how many times 515 goes into 21072853.

On to step 1:
515 can be fit into 2 0 times, resulting in a remainder of 2.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 2 and we're left with 2.
Grab the next digit (1) from the dividend, add it to 2, then carry on: 21 / 515

Moving on to step 2:
21 divided by 515 is 0 with a remainder of 21.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 21, we end up with 21.
Bring next digit (0) of the dividend behind the 21 and repeat the process: 210 / 515

Let's proceed to step 3:
515 can be fit into 210 0 times, resulting in a remainder of 210.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 210 after subtracting 0 from 210.
Take the next digit (7) from the dividend and append it to 210, then repeat: 2107 / 515

On to step 4:
515 can be fit into 2107 4 times, resulting in a remainder of 47.
The next digit of our result is 4. 
Result so far: 4.0
Subtracting 2060 from 2107 leaves us with 47.
Bring next digit (2) of the dividend behind the 47 and repeat the process: 472 / 515

Advancing to step 5:
When dividing 472 by 515, we get 0 with a remainder of 472.
Use 0 as the next digit of our solution. 
Result so far: 40.0
The remainder is 472 after subtracting 0 from 472.
Grab the next digit (8) from the dividend, add it to 472, then carry on: 4728 / 515

On to step 6:
515 can be fit into 4728 9 times, resulting in a remainder of 93.
Record the quotient 9 as the next digit in the result. 
Result so far: 409.0
Subtracting 4635 from 4728 leaves us with 93.
Fetch the next digit (5) from the dividend, attach it to 93 and continue: 935 / 515

Let's proceed to step 7:
If we divide 935 by 515, we get 1 and a remainder of 420.
Record the quotient 1 as the next digit in the result. 
Result so far: 4091.0
If we take 515 away from 935, we end up with 420.
Append the next digit (3) from the dividend to 420 and continue with: 4203 / 515

On to step 8:
When dividing 4203 by 515, we get 8 with a remainder of 83.
The number 8 becomes the next digit in our result. 
Result so far: 40918.0
Subtract 4120 from 4203 to get 83.
Since there are no more digits in the dividend, we add a zero to the remainder making it 830, and continue the process.

Moving on to step 9:
515 can be fit into 830 1 times, resulting in a remainder of 315.
The next digit of our result is 1. 
Result so far: 40918.1
The remainder is 315 after subtracting 515 from 830.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3150, and continue the process.

On to step 10:
515 can be fit into 3150 6 times, resulting in a remainder of 60.
Use 6 as the next digit of our solution. 
Result so far: 40918.16
If we subtract 3090 from 3150, 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 11:
515 goes into 600 1 times with a remainder of 85.
The next digit of our result is 1. 
Result so far: 40918.161
The remainder is 85 after subtracting 515 from 600.
Since there are no more digits in the dividend, we add a zero to the remainder making it 850, and continue the process.

Advancing to step 12:
The number 515 fits into 850 1 times, leaving a remainder of 335.
The number 1 becomes the next digit in our result. 
Result so far: 40918.1611
The remainder is 335 after subtracting 515 from 850.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3350, and continue the process.

After the division, we end up with 40918.1611 and a remainder of 0.00335.