We look at the division of 843477 by 21 
We're looking to find how many times 21 goes into 843477.

Moving on to step 1:
When dividing 8 by 21, we get 0 with a remainder of 8.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 8, we get 8.
Include the next digit (4) from the dividend after 8, then repeat: 84 / 21

Moving on to step 2:
21 goes into 84 4 times with a remainder of 0.
The next digit of our result is 4. 
Result so far: 4.0
Deduct 84 from 84 and we're left with 0.
Include the next digit (3) from the dividend after 0, then repeat: 3 / 21

Advancing to step 3:
3 divided by 21 is 0 with a remainder of 3.
Use 0 as the next digit of our solution. 
Result so far: 40.0
Deduct 0 from 3 and we're left with 3.
Append the next digit (4) from the dividend to 3 and continue with: 34 / 21

Let's proceed to step 4:
When dividing 34 by 21, we get 1 with a remainder of 13.
Put 1 as the next digit of the answer. 
Result so far: 401.0
If we take 21 away from 34, we end up with 13.
Append the next digit (7) from the dividend to 13 and continue with: 137 / 21

Moving on to step 5:
When dividing 137 by 21, we get 6 with a remainder of 11.
The next digit of our result is 6. 
Result so far: 4016.0
Subtracting 126 from 137 leaves us with 11.
Bring next digit (7) of the dividend behind the 11 and repeat the process: 117 / 21

Advancing to step 6:
The number 21 fits into 117 5 times, leaving a remainder of 12.
Put 5 as the next digit of the answer. 
Result so far: 40165.0
Subtract 105 from 117 to get 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Let's proceed to step 7:
120 divided by 21 is 5 with a remainder of 15.
The number 5 becomes the next digit in our result. 
Result so far: 40165.5
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.

Step 8:
150 divided by 21 is 7 with a remainder of 3.
Write down 7 as next digit of the result. 
Result so far: 40165.57
The remainder is 3 after subtracting 147 from 150.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Going ahead to step 9:
30 divided by 21 is 1 with a remainder of 9.
Put 1 as the next digit of the answer. 
Result so far: 40165.571
Subtracting 21 from 30 leaves us 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.

Going ahead to step 10:
When dividing 90 by 21, we get 4 with a remainder of 6.
Put 4 as the next digit of the answer. 
Result so far: 40165.5714
If we subtract 84 from 90, we get 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Advancing to step 11:
60 divided by 21 is 2 with a remainder of 18.
Use 2 as the next digit of our solution. 
Result so far: 40165.57142
The remainder is 18 after subtracting 42 from 60.
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:
The number 21 fits into 180 8 times, leaving a remainder of 12.
Record the quotient 8 as the next digit in the result. 
Result so far: 40165.571428
The remainder is 12 after subtracting 168 from 180.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Step 13:
The number 21 fits into 120 5 times, leaving a remainder of 15.
The next digit of our result is 5. 
Result so far: 40165.5714285
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.

Step 14:
The number 21 fits into 150 7 times, leaving a remainder of 3.
Put 7 as the next digit of the answer. 
Result so far: 40165.57142857
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.

After the division, we end up with 40165.57142857 and a remainder of 3e-09.