We divide 801791 by 21
We're looking to find how many times 21 goes into 801791.

On to step 1:
8 divided by 21 is 0 with a remainder of 8.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 8, we get 8.
Take the next digit (0) from the dividend and append it to 8, then repeat: 80 / 21

Step 2:
21 goes into 80 3 times with a remainder of 17.
Use 3 as the next digit of our solution. 
Result so far: 3.0
Deduct 63 from 80 and we're left with 17.
Fetch the next digit (1) from the dividend, attach it to 17 and continue: 171 / 21

On to step 3:
When dividing 171 by 21, we get 8 with a remainder of 3.
The number 8 becomes the next digit in our result. 
Result so far: 38.0
Subtracting 168 from 171 leaves us with 3.
Fetch the next digit (7) from the dividend, attach it to 3 and continue: 37 / 21

On to step 4:
The number 21 fits into 37 1 times, leaving a remainder of 16.
Put 1 as the next digit of the answer. 
Result so far: 381.0
Subtract 21 from 37 to get 16.
Append the next digit (9) from the dividend to 16 and continue with: 169 / 21

Going ahead to step 5:
169 divided by 21 is 8 with a remainder of 1.
Record the quotient 8 as the next digit in the result. 
Result so far: 3818.0
Subtract 168 from 169 to get 1.
Grab the next digit (1) from the dividend, add it to 1, then carry on: 11 / 21

Going ahead to step 6:
11 divided by 21 is 0 with a remainder of 11.
The number 0 becomes the next digit in our result. 
Result so far: 38180.0
If we take 0 away from 11, we end up with 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Advancing to step 7:
When dividing 110 by 21, we get 5 with a remainder of 5.
Use 5 as the next digit of our solution. 
Result so far: 38180.5
If we take 105 away from 110, we end up with 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Let's proceed to step 8:
21 can be fit into 50 2 times, resulting in a remainder of 8.
Put 2 as the next digit of the answer. 
Result so far: 38180.52
Subtracting 42 from 50 leaves us with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

On to step 9:
The number 21 fits into 80 3 times, leaving a remainder of 17.
Write down 3 as next digit of the result. 
Result so far: 38180.523
Deduct 63 from 80 and we're left with 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

Step 10:
170 divided by 21 is 8 with a remainder of 2.
Use 8 as the next digit of our solution. 
Result so far: 38180.5238
The remainder is 2 after subtracting 168 from 170.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

On to step 11:
20 divided by 21 is 0 with a remainder of 20.
Use 0 as the next digit of our solution. 
Result so far: 38180.5238
If we take 0 away from 20, we end up with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Let's proceed to step 12:
When dividing 200 by 21, we get 9 with a remainder of 11.
Put 9 as the next digit of the answer. 
Result so far: 38180.523809
Deduct 189 from 200 and we're left with 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

On to step 13:
21 can be fit into 110 5 times, resulting in a remainder of 5.
Record the quotient 5 as the next digit in the result. 
Result so far: 38180.5238095
Subtract 105 from 110 to get 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Going ahead to step 14:
The number 21 fits into 50 2 times, leaving a remainder of 8.
Use 2 as the next digit of our solution. 
Result so far: 38180.52380952
The remainder is 8 after subtracting 42 from 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Our division results in 38180.52380952 with a remaining 8e-09.