We look at the division of 21042 by 11 
We're looking to find how many times 11 goes into 21042.

On to step 1:
2 divided by 11 is 0 with a remainder of 2.
Use 0 as the next digit of our solution. 
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 / 11

Let's proceed to step 2:
The number 11 fits into 21 1 times, leaving a remainder of 10.
Write down 1 as next digit of the result. 
Result so far: 1.0
Deduct 11 from 21 and we're left with 10.
Append the next digit (0) from the dividend to 10 and continue with: 100 / 11

Moving on to step 3:
If we divide 100 by 11, we get 9 and a remainder of 1.
Write down 9 as next digit of the result. 
Result so far: 19.0
Subtract 99 from 100 to get 1.
Bring next digit (4) of the dividend behind the 1 and repeat the process: 14 / 11

Step 4:
If we divide 14 by 11, we get 1 and a remainder of 3.
Record the quotient 1 as the next digit in the result. 
Result so far: 191.0
Deduct 11 from 14 and we're left with 3.
Bring next digit (2) of the dividend behind the 3 and repeat the process: 32 / 11

Moving on to step 5:
If we divide 32 by 11, we get 2 and a remainder of 10.
Record the quotient 2 as the next digit in the result. 
Result so far: 1912.0
If we subtract 22 from 32, we get 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Going ahead to step 6:
If we divide 100 by 11, we get 9 and a remainder of 1.
Write down 9 as next digit of the result. 
Result so far: 1912.9
If we take 99 away from 100, we end up with 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Step 7:
11 can be fit into 10 0 times, resulting in a remainder of 10.
Put 0 as the next digit of the answer. 
Result so far: 1912.9
Deduct 0 from 10 and we're left with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Step 8:
The number 11 fits into 100 9 times, leaving a remainder of 1.
Write down 9 as next digit of the result. 
Result so far: 1912.909
If we subtract 99 from 100, we get 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Advancing to step 9:
If we divide 10 by 11, we get 0 and a remainder of 10.
The next digit of our result is 0. 
Result so far: 1912.909
If we subtract 0 from 10, we get 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Step 10:
The number 11 fits into 100 9 times, leaving a remainder of 1.
Record the quotient 9 as the next digit in the result. 
Result so far: 1912.90909
If we take 99 away from 100, we end up with 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Moving on to step 11:
If we divide 10 by 11, we get 0 and a remainder of 10.
The next digit of our result is 0. 
Result so far: 1912.90909
If we subtract 0 from 10, we get 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

On to step 12:
11 can be fit into 100 9 times, resulting in a remainder of 1.
Put 9 as the next digit of the answer. 
Result so far: 1912.9090909
Subtracting 99 from 100 leaves us with 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

On to step 13:
The number 11 fits into 10 0 times, leaving a remainder of 10.
The next digit of our result is 0. 
Result so far: 1912.9090909
If we subtract 0 from 10, we get 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

The quotient of the division is 1912.9090909, and the remainder is 1e-08.