853720 ÷ 21 
We want to divide 853720 by 21.

On to step 1:
8 divided by 21 is 0 with a remainder of 8.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 8 leaves us with 8.
Include the next digit (5) from the dividend after 8, then repeat: 85 / 21

Advancing to step 2:
When dividing 85 by 21, we get 4 with a remainder of 1.
The number 4 becomes the next digit in our result. 
Result so far: 4.0
Subtracting 84 from 85 leaves us with 1.
Take the next digit (3) from the dividend and append it to 1, then repeat: 13 / 21

Advancing to step 3:
21 can be fit into 13 0 times, resulting in a remainder of 13.
The next digit of our result is 0. 
Result so far: 40.0
Subtract 0 from 13 to get 13.
Include the next digit (7) from the dividend after 13, then repeat: 137 / 21

Going ahead to step 4:
21 can be fit into 137 6 times, resulting in a remainder of 11.
Write down 6 as next digit of the result. 
Result so far: 406.0
If we subtract 126 from 137, we get 11.
Append the next digit (2) from the dividend to 11 and continue with: 112 / 21

Step 5:
If we divide 112 by 21, we get 5 and a remainder of 7.
Use 5 as the next digit of our solution. 
Result so far: 4065.0
If we take 105 away from 112, we end up with 7.
Bring next digit (0) of the dividend behind the 7 and repeat the process: 70 / 21

Step 6:
When dividing 70 by 21, we get 3 with a remainder of 7.
Write down 3 as next digit of the result. 
Result so far: 40653.0
If we take 63 away from 70, we end up with 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

Let's proceed to step 7:
70 divided by 21 is 3 with a remainder of 7.
Record the quotient 3 as the next digit in the result. 
Result so far: 40653.3
Deduct 63 from 70 and we're left with 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

Moving on to step 8:
70 divided by 21 is 3 with a remainder of 7.
Write down 3 as next digit of the result. 
Result so far: 40653.33
Deduct 63 from 70 and we're left with 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

Our division results in 40653.33 with a remaining 0.007.