We divide 852180 by 21
We're looking to find how many times 21 goes into 852180.

Advancing 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
Subtract 0 from 8 to get 8.
Take the next digit (5) from the dividend and append it to 8, then repeat: 85 / 21

Advancing to step 2:
21 can be fit into 85 4 times, resulting in a remainder of 1.
The next digit of our result is 4. 
Result so far: 4.0
Subtracting 84 from 85 leaves us with 1.
Append the next digit (2) from the dividend to 1 and continue with: 12 / 21

Advancing to step 3:
21 can be fit into 12 0 times, resulting in a remainder of 12.
Write down 0 as next digit of the result. 
Result so far: 40.0
Subtract 0 from 12 to get 12.
Grab the next digit (1) from the dividend, add it to 12, then carry on: 121 / 21

Step 4:
121 divided by 21 is 5 with a remainder of 16.
The number 5 becomes the next digit in our result. 
Result so far: 405.0
Subtracting 105 from 121 leaves us with 16.
Take the next digit (8) from the dividend and append it to 16, then repeat: 168 / 21

Going ahead to step 5:
When dividing 168 by 21, we get 8 with a remainder of 0.
Use 8 as the next digit of our solution. 
Result so far: 4058.0
Subtract 168 from 168 to get 0.
Fetch the next digit (0) from the dividend, attach it to 0 and continue: 0 / 21

On to step 6:
0 divided by 21 is 0 with a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 40580.0
The remainder is 0 after subtracting 0 from 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Step 7:
The number 21 fits into 0 0 times, leaving a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 40580.0
Deduct 0 from 0 and we're left with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Advancing to step 8:
21 can be fit into 0 0 times, resulting in a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 40580.0
Deduct 0 from 0 and we're left with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Our division results in 40580.0 with a remaining 0.0.