We divide 801346 by 21
Let's see how many times 21 fits into 801346.

Step 1:
21 can be fit into 8 0 times, resulting in a remainder of 8.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 8 to get 8.
Grab the next digit (0) from the dividend, add it to 8, then carry on: 80 / 21

On to step 2:
21 goes into 80 3 times with a remainder of 17.
Put 3 as the next digit of the answer. 
Result so far: 3.0
If we take 63 away from 80, we end up with 17.
Grab the next digit (1) from the dividend, add it to 17, then carry on: 171 / 21

On to step 3:
If we divide 171 by 21, we get 8 and a remainder of 3.
The number 8 becomes the next digit in our result. 
Result so far: 38.0
Deduct 168 from 171 and we're left with 3.
Fetch the next digit (3) from the dividend, attach it to 3 and continue: 33 / 21

Moving on to step 4:
When dividing 33 by 21, we get 1 with a remainder of 12.
Use 1 as the next digit of our solution. 
Result so far: 381.0
Subtract 21 from 33 to get 12.
Take the next digit (4) from the dividend and append it to 12, then repeat: 124 / 21

Step 5:
When dividing 124 by 21, we get 5 with a remainder of 19.
The number 5 becomes the next digit in our result. 
Result so far: 3815.0
If we subtract 105 from 124, we get 19.
Take the next digit (6) from the dividend and append it to 19, then repeat: 196 / 21

Let's proceed to step 6:
The number 21 fits into 196 9 times, leaving a remainder of 7.
Write down 9 as next digit of the result. 
Result so far: 38159.0
Subtract 189 from 196 to get 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

Step 7:
21 can be fit into 70 3 times, resulting in a remainder of 7.
The next digit of our result is 3. 
Result so far: 38159.3
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.

Advancing to step 8:
21 can be fit into 70 3 times, resulting in a remainder of 7.
Put 3 as the next digit of the answer. 
Result so far: 38159.33
Subtract 63 from 70 to get 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

After the division, we end up with 38159.33 and a remainder of 0.007.