We look at the division of 265599 by 21 
We want to divide 265599 by 21.

Step 1:
21 goes into 2 0 times with a remainder of 2.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 2 and we're left with 2.
Fetch the next digit (6) from the dividend, attach it to 2 and continue: 26 / 21

Step 2:
When dividing 26 by 21, we get 1 with a remainder of 5.
The next digit of our result is 1. 
Result so far: 1.0
Subtract 21 from 26 to get 5.
Append the next digit (5) from the dividend to 5 and continue with: 55 / 21

Step 3:
The number 21 fits into 55 2 times, leaving a remainder of 13.
The next digit of our result is 2. 
Result so far: 12.0
If we take 42 away from 55, we end up with 13.
Bring next digit (5) of the dividend behind the 13 and repeat the process: 135 / 21

Moving on to step 4:
If we divide 135 by 21, we get 6 and a remainder of 9.
The next digit of our result is 6. 
Result so far: 126.0
If we take 126 away from 135, we end up with 9.
Include the next digit (9) from the dividend after 9, then repeat: 99 / 21

Step 5:
21 can be fit into 99 4 times, resulting in a remainder of 15.
Put 4 as the next digit of the answer. 
Result so far: 1264.0
The remainder is 15 after subtracting 84 from 99.
Fetch the next digit (9) from the dividend, attach it to 15 and continue: 159 / 21

Moving on to step 6:
159 divided by 21 is 7 with a remainder of 12.
Use 7 as the next digit of our solution. 
Result so far: 12647.0
Deduct 147 from 159 and we're left with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Going ahead to step 7:
If we divide 120 by 21, we get 5 and a remainder of 15.
Record the quotient 5 as the next digit in the result. 
Result so far: 12647.5
Deduct 105 from 120 and we're left 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.

Advancing to step 8:
21 goes into 150 7 times with a remainder of 3.
Put 7 as the next digit of the answer. 
Result so far: 12647.57
Subtracting 147 from 150 leaves us with 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Let's proceed to step 9:
21 goes into 30 1 times with a remainder of 9.
Record the quotient 1 as the next digit in the result. 
Result so far: 12647.571
Deduct 21 from 30 and we're left with 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

On to step 10:
90 divided by 21 is 4 with a remainder of 6.
Record the quotient 4 as the next digit in the result. 
Result so far: 12647.5714
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.

On to step 11:
If we divide 60 by 21, we get 2 and a remainder of 18.
Use 2 as the next digit of our solution. 
Result so far: 12647.57142
Deduct 42 from 60 and we're left 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.

Step 12:
180 divided by 21 is 8 with a remainder of 12.
Use 8 as the next digit of our solution. 
Result so far: 12647.571428
If we take 168 away from 180, we end up with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

On to step 13:
When dividing 120 by 21, we get 5 with a remainder of 15.
The next digit of our result is 5. 
Result so far: 12647.5714285
The remainder is 15 after subtracting 105 from 120.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

On to step 14:
If we divide 150 by 21, we get 7 and a remainder of 3.
The next digit of our result is 7. 
Result so far: 12647.57142857
Subtracting 147 from 150 leaves us with 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

The quotient of the division is 12647.57142857, and the remainder is 3e-09.