Let's divide 835243 by 21
We're looking to find how many times 21 goes into 835243.

Moving on to step 1:
When dividing 8 by 21, we get 0 with a remainder of 8.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 8 after subtracting 0 from 8.
Append the next digit (3) from the dividend to 8 and continue with: 83 / 21

Advancing to step 2:
When dividing 83 by 21, we get 3 with a remainder of 20.
Write down 3 as next digit of the result. 
Result so far: 3.0
If we take 63 away from 83, we end up with 20.
Grab the next digit (5) from the dividend, add it to 20, then carry on: 205 / 21

On to step 3:
If we divide 205 by 21, we get 9 and a remainder of 16.
The next digit of our result is 9. 
Result so far: 39.0
Deduct 189 from 205 and we're left with 16.
Take the next digit (2) from the dividend and append it to 16, then repeat: 162 / 21

Let's proceed to step 4:
When dividing 162 by 21, we get 7 with a remainder of 15.
Write down 7 as next digit of the result. 
Result so far: 397.0
Subtract 147 from 162 to get 15.
Grab the next digit (4) from the dividend, add it to 15, then carry on: 154 / 21

Moving on to step 5:
21 goes into 154 7 times with a remainder of 7.
The number 7 becomes the next digit in our result. 
Result so far: 3977.0
The remainder is 7 after subtracting 147 from 154.
Grab the next digit (3) from the dividend, add it to 7, then carry on: 73 / 21

Moving on to step 6:
21 goes into 73 3 times with a remainder of 10.
The number 3 becomes the next digit in our result. 
Result so far: 39773.0
Deduct 63 from 73 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.

Going ahead to step 7:
100 divided by 21 is 4 with a remainder of 16.
The number 4 becomes the next digit in our result. 
Result so far: 39773.4
If we subtract 84 from 100, we get 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Moving on to step 8:
21 can be fit into 160 7 times, resulting in a remainder of 13.
Use 7 as the next digit of our solution. 
Result so far: 39773.47
The remainder is 13 after subtracting 147 from 160.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

Step 9:
If we divide 130 by 21, we get 6 and a remainder of 4.
Write down 6 as next digit of the result. 
Result so far: 39773.476
Deduct 126 from 130 and we're left with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

On to step 10:
21 can be fit into 40 1 times, resulting in a remainder of 19.
Put 1 as the next digit of the answer. 
Result so far: 39773.4761
Deduct 21 from 40 and we're left with 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

Let's proceed to step 11:
When dividing 190 by 21, we get 9 with a remainder of 1.
Put 9 as the next digit of the answer. 
Result so far: 39773.47619
If we subtract 189 from 190, 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.

Let's proceed to step 12:
When dividing 10 by 21, we get 0 with a remainder of 10.
The number 0 becomes the next digit in our result. 
Result so far: 39773.47619
The remainder is 10 after subtracting 0 from 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 13:
The number 21 fits into 100 4 times, leaving a remainder of 16.
Write down 4 as next digit of the result. 
Result so far: 39773.4761904
Subtract 84 from 100 to get 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Going ahead to step 14:
21 goes into 160 7 times with a remainder of 13.
Put 7 as the next digit of the answer. 
Result so far: 39773.47619047
Subtracting 147 from 160 leaves us with 13.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

The final outcome is 39773.47619047, with a leftover of 1.3e-08.