We look at the division of 266348 by 21 
We're looking to find how many times 21 goes into 266348.

Advancing to step 1:
When dividing 2 by 21, we get 0 with a remainder of 2.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 2 to get 2.
Bring next digit (6) of the dividend behind the 2 and repeat the process: 26 / 21

Going ahead to step 2:
21 can be fit into 26 1 times, resulting in a remainder of 5.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
If we take 21 away from 26, we end up with 5.
Include the next digit (6) from the dividend after 5, then repeat: 56 / 21

Moving on to step 3:
The number 21 fits into 56 2 times, leaving a remainder of 14.
Use 2 as the next digit of our solution. 
Result so far: 12.0
Deduct 42 from 56 and we're left with 14.
Bring next digit (3) of the dividend behind the 14 and repeat the process: 143 / 21

Going ahead to step 4:
21 goes into 143 6 times with a remainder of 17.
Write down 6 as next digit of the result. 
Result so far: 126.0
Subtracting 126 from 143 leaves us with 17.
Bring next digit (4) of the dividend behind the 17 and repeat the process: 174 / 21

Going ahead to step 5:
When dividing 174 by 21, we get 8 with a remainder of 6.
Write down 8 as next digit of the result. 
Result so far: 1268.0
If we take 168 away from 174, we end up with 6.
Grab the next digit (8) from the dividend, add it to 6, then carry on: 68 / 21

Moving on to step 6:
21 can be fit into 68 3 times, resulting in a remainder of 5.
Write down 3 as next digit of the result. 
Result so far: 12683.0
Subtract 63 from 68 to get 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

On to step 7:
When dividing 50 by 21, we get 2 with a remainder of 8.
Put 2 as the next digit of the answer. 
Result so far: 12683.2
Subtracting 42 from 50 leaves us with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Going ahead to step 8:
If we divide 80 by 21, we get 3 and a remainder of 17.
Put 3 as the next digit of the answer. 
Result so far: 12683.23
Subtracting 63 from 80 leaves us with 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

Moving on to step 9:
If we divide 170 by 21, we get 8 and a remainder of 2.
Put 8 as the next digit of the answer. 
Result so far: 12683.238
The remainder is 2 after subtracting 168 from 170.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Let's proceed to step 10:
The number 21 fits into 20 0 times, leaving a remainder of 20.
Record the quotient 0 as the next digit in the result. 
Result so far: 12683.238
If we subtract 0 from 20, we get 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Advancing to step 11:
21 goes into 200 9 times with a remainder of 11.
The number 9 becomes the next digit in our result. 
Result so far: 12683.23809
Subtracting 189 from 200 leaves us with 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Advancing to step 12:
110 divided by 21 is 5 with a remainder of 5.
The next digit of our result is 5. 
Result so far: 12683.238095
Deduct 105 from 110 and we're left 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 13:
If we divide 50 by 21, we get 2 and a remainder of 8.
Put 2 as the next digit of the answer. 
Result so far: 12683.2380952
The remainder is 8 after subtracting 42 from 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Going ahead to step 14:
21 can be fit into 80 3 times, resulting in a remainder of 17.
Write down 3 as next digit of the result. 
Result so far: 12683.23809523
Subtract 63 from 80 to get 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

Our division results in 12683.23809523 with a remaining 1.7e-08.