We look at the division of 870829 by 21 
Our goal is to divide 870829 by 21.

Going ahead to step 1:
If we divide 8 by 21, we get 0 and a remainder of 8.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 8, we end up with 8.
Include the next digit (7) from the dividend after 8, then repeat: 87 / 21

On to step 2:
87 divided by 21 is 4 with a remainder of 3.
Record the quotient 4 as the next digit in the result. 
Result so far: 4.0
If we take 84 away from 87, we end up with 3.
Include the next digit (0) from the dividend after 3, then repeat: 30 / 21

Going ahead to step 3:
If we divide 30 by 21, we get 1 and a remainder of 9.
Use 1 as the next digit of our solution. 
Result so far: 41.0
The remainder is 9 after subtracting 21 from 30.
Take the next digit (8) from the dividend and append it to 9, then repeat: 98 / 21

Let's proceed to step 4:
The number 21 fits into 98 4 times, leaving a remainder of 14.
Write down 4 as next digit of the result. 
Result so far: 414.0
Subtracting 84 from 98 leaves us with 14.
Include the next digit (2) from the dividend after 14, then repeat: 142 / 21

On to step 5:
If we divide 142 by 21, we get 6 and a remainder of 16.
Record the quotient 6 as the next digit in the result. 
Result so far: 4146.0
Subtract 126 from 142 to get 16.
Append the next digit (9) from the dividend to 16 and continue with: 169 / 21

Advancing to step 6:
21 can be fit into 169 8 times, resulting in a remainder of 1.
The next digit of our result is 8. 
Result so far: 41468.0
The remainder is 1 after subtracting 168 from 169.
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:
When dividing 10 by 21, we get 0 with a remainder of 10.
Record the quotient 0 as the next digit in the result. 
Result so far: 41468.0
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:
If we divide 100 by 21, we get 4 and a remainder of 16.
The next digit of our result is 4. 
Result so far: 41468.04
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.

Let's proceed to step 9:
If we divide 160 by 21, we get 7 and a remainder of 13.
Write down 7 as next digit of the result. 
Result so far: 41468.047
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.

Advancing to step 10:
21 can be fit into 130 6 times, resulting in a remainder of 4.
Write down 6 as next digit of the result. 
Result so far: 41468.0476
If we subtract 126 from 130, we get 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Advancing to step 11:
If we divide 40 by 21, we get 1 and a remainder of 19.
Write down 1 as next digit of the result. 
Result so far: 41468.04761
The remainder is 19 after subtracting 21 from 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

Moving on to step 12:
If we divide 190 by 21, we get 9 and a remainder of 1.
Put 9 as the next digit of the answer. 
Result so far: 41468.047619
Subtracting 189 from 190 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.

Going ahead to step 13:
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: 41468.047619
Subtract 0 from 10 to 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 14:
If we divide 100 by 21, we get 4 and a remainder of 16.
The number 4 becomes the next digit in our result. 
Result so far: 41468.04761904
Subtracting 84 from 100 leaves us with 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Our division results in 41468.04761904 with a remaining 1.6e-08.