Let's divide 515265 by 21
We're looking to find how many times 21 goes into 515265.

Going ahead to step 1:
5 divided by 21 is 0 with a remainder of 5.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 5, we get 5.
Fetch the next digit (1) from the dividend, attach it to 5 and continue: 51 / 21

On to step 2:
If we divide 51 by 21, we get 2 and a remainder of 9.
The number 2 becomes the next digit in our result. 
Result so far: 2.0
If we subtract 42 from 51, we get 9.
Grab the next digit (5) from the dividend, add it to 9, then carry on: 95 / 21

Step 3:
21 goes into 95 4 times with a remainder of 11.
The number 4 becomes the next digit in our result. 
Result so far: 24.0
If we subtract 84 from 95, we get 11.
Grab the next digit (2) from the dividend, add it to 11, then carry on: 112 / 21

Step 4:
The number 21 fits into 112 5 times, leaving a remainder of 7.
Write down 5 as next digit of the result. 
Result so far: 245.0
Deduct 105 from 112 and we're left with 7.
Include the next digit (6) from the dividend after 7, then repeat: 76 / 21

Advancing to step 5:
21 goes into 76 3 times with a remainder of 13.
Use 3 as the next digit of our solution. 
Result so far: 2453.0
Deduct 63 from 76 and we're left with 13.
Include the next digit (5) from the dividend after 13, then repeat: 135 / 21

Let's proceed to step 6:
When dividing 135 by 21, we get 6 with a remainder of 9.
Use 6 as the next digit of our solution. 
Result so far: 24536.0
Subtract 126 from 135 to get 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Let's proceed to step 7:
21 goes into 90 4 times with a remainder of 6.
Put 4 as the next digit of the answer. 
Result so far: 24536.4
The remainder is 6 after subtracting 84 from 90.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Moving on to step 8:
21 goes into 60 2 times with a remainder of 18.
The number 2 becomes the next digit in our result. 
Result so far: 24536.42
If we subtract 42 from 60, we get 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Step 9:
180 divided by 21 is 8 with a remainder of 12.
Record the quotient 8 as the next digit in the result. 
Result so far: 24536.428
Subtract 168 from 180 to get 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Advancing to step 10:
21 can be fit into 120 5 times, resulting in a remainder of 15.
Use 5 as the next digit of our solution. 
Result so far: 24536.4285
If we take 105 away from 120, we end up with 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Going ahead to step 11:
When dividing 150 by 21, we get 7 with a remainder of 3.
The next digit of our result is 7. 
Result so far: 24536.42857
If we subtract 147 from 150, we get 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Moving on to step 12:
The number 21 fits into 30 1 times, leaving a remainder of 9.
Use 1 as the next digit of our solution. 
Result so far: 24536.428571
Subtract 21 from 30 to get 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Advancing to step 13:
21 can be fit into 90 4 times, resulting in a remainder of 6.
The next digit of our result is 4. 
Result so far: 24536.4285714
Deduct 84 from 90 and we're left with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Moving on to step 14:
When dividing 60 by 21, we get 2 with a remainder of 18.
Record the quotient 2 as the next digit in the result. 
Result so far: 24536.42857142
If we take 42 away from 60, we end up with 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

The quotient of the division is 24536.42857142, and the remainder is 1.8e-08.