Let's divide 854363 by 21
We want to figure out the number of times 854363 can be divided by 21.

Going ahead to step 1:
21 goes into 8 0 times with a remainder of 8.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 8 and we're left with 8.
Take the next digit (5) from the dividend and append it to 8, then repeat: 85 / 21

Advancing to step 2:
21 goes into 85 4 times with a remainder of 1.
Write down 4 as next digit of the result. 
Result so far: 4.0
Deduct 84 from 85 and we're left with 1.
Fetch the next digit (4) from the dividend, attach it to 1 and continue: 14 / 21

On to step 3:
The number 21 fits into 14 0 times, leaving a remainder of 14.
Put 0 as the next digit of the answer. 
Result so far: 40.0
Subtracting 0 from 14 leaves us with 14.
Include the next digit (3) from the dividend after 14, then repeat: 143 / 21

Moving on to step 4:
If we divide 143 by 21, we get 6 and a remainder of 17.
Write down 6 as next digit of the result. 
Result so far: 406.0
The remainder is 17 after subtracting 126 from 143.
Include the next digit (6) from the dividend after 17, then repeat: 176 / 21

Going ahead to step 5:
If we divide 176 by 21, we get 8 and a remainder of 8.
Write down 8 as next digit of the result. 
Result so far: 4068.0
Subtracting 168 from 176 leaves us with 8.
Grab the next digit (3) from the dividend, add it to 8, then carry on: 83 / 21

On to step 6:
83 divided by 21 is 3 with a remainder of 20.
Put 3 as the next digit of the answer. 
Result so far: 40683.0
Subtract 63 from 83 to 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 7:
21 goes into 200 9 times with a remainder of 11.
The number 9 becomes the next digit in our result. 
Result so far: 40683.9
If we take 189 away from 200, we end up 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.

Step 8:
If we divide 110 by 21, we get 5 and a remainder of 5.
The next digit of our result is 5. 
Result so far: 40683.95
Subtract 105 from 110 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.

Going ahead to step 9:
21 goes into 50 2 times with a remainder of 8.
Put 2 as the next digit of the answer. 
Result so far: 40683.952
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.

On to step 10:
The number 21 fits into 80 3 times, leaving a remainder of 17.
The next digit of our result is 3. 
Result so far: 40683.9523
The remainder is 17 after subtracting 63 from 80.
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 11:
21 goes into 170 8 times with a remainder of 2.
Record the quotient 8 as the next digit in the result. 
Result so far: 40683.95238
Subtracting 168 from 170 leaves us with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Advancing to step 12:
The number 21 fits into 20 0 times, leaving a remainder of 20.
Write down 0 as next digit of the result. 
Result so far: 40683.95238
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.

Moving on to step 13:
21 can be fit into 200 9 times, resulting in a remainder of 11.
The next digit of our result is 9. 
Result so far: 40683.9523809
The remainder is 11 after subtracting 189 from 200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Let's proceed to step 14:
21 can be fit into 110 5 times, resulting in a remainder of 5.
The next digit of our result is 5. 
Result so far: 40683.95238095
Subtracting 105 from 110 leaves us 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.

After the division, we end up with 40683.95238095 and a remainder of 5e-09.