Let's divide 811185 by 21
We're looking to find how many times 21 goes into 811185.

Step 1:
The number 21 fits into 8 0 times, leaving 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.
Fetch the next digit (1) from the dividend, attach it to 8 and continue: 81 / 21

Going ahead to step 2:
When dividing 81 by 21, we get 3 with a remainder of 18.
Put 3 as the next digit of the answer. 
Result so far: 3.0
If we take 63 away from 81, we end up with 18.
Fetch the next digit (1) from the dividend, attach it to 18 and continue: 181 / 21

Let's proceed to step 3:
If we divide 181 by 21, we get 8 and a remainder of 13.
Record the quotient 8 as the next digit in the result. 
Result so far: 38.0
The remainder is 13 after subtracting 168 from 181.
Grab the next digit (1) from the dividend, add it to 13, then carry on: 131 / 21

Advancing to step 4:
21 can be fit into 131 6 times, resulting in a remainder of 5.
The number 6 becomes the next digit in our result. 
Result so far: 386.0
Deduct 126 from 131 and we're left with 5.
Include the next digit (8) from the dividend after 5, then repeat: 58 / 21

Advancing to step 5:
21 can be fit into 58 2 times, resulting in a remainder of 16.
Put 2 as the next digit of the answer. 
Result so far: 3862.0
The remainder is 16 after subtracting 42 from 58.
Bring next digit (5) of the dividend behind the 16 and repeat the process: 165 / 21

Step 6:
21 can be fit into 165 7 times, resulting in a remainder of 18.
Put 7 as the next digit of the answer. 
Result so far: 38627.0
If we take 147 away from 165, we end up with 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Step 7:
The number 21 fits into 180 8 times, leaving a remainder of 12.
The next digit of our result is 8. 
Result so far: 38627.8
Subtract 168 from 180 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.

Step 8:
When dividing 120 by 21, we get 5 with a remainder of 15.
The next digit of our result is 5. 
Result so far: 38627.85
Subtracting 105 from 120 leaves us 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.

Let's proceed to step 9:
If we divide 150 by 21, we get 7 and a remainder of 3.
Put 7 as the next digit of the answer. 
Result so far: 38627.857
Subtract 147 from 150 to get 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Advancing to step 10:
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: 38627.8571
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.

Step 11:
90 divided by 21 is 4 with a remainder of 6.
Use 4 as the next digit of our solution. 
Result so far: 38627.85714
Subtracting 84 from 90 leaves us with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Moving on to step 12:
When dividing 60 by 21, we get 2 with a remainder of 18.
Record the quotient 2 as the next digit in the result. 
Result so far: 38627.857142
Subtract 42 from 60 to get 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Going ahead to step 13:
The number 21 fits into 180 8 times, leaving a remainder of 12.
The number 8 becomes the next digit in our result. 
Result so far: 38627.8571428
If we take 168 away from 180, we end up with 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 14:
If we divide 120 by 21, we get 5 and a remainder of 15.
Record the quotient 5 as the next digit in the result. 
Result so far: 38627.85714285
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.

Our division results in 38627.85714285 with a remaining 1.5e-08.