806386 ÷ 21 
We want to divide 806386 by 21.

Moving on to step 1:
8 divided by 21 is 0 with a remainder of 8.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 8 to get 8.
Take the next digit (0) from the dividend and append it to 8, then repeat: 80 / 21

Let's proceed to step 2:
If we divide 80 by 21, we get 3 and a remainder of 17.
Write down 3 as next digit of the result. 
Result so far: 3.0
If we take 63 away from 80, we end up with 17.
Bring next digit (6) of the dividend behind the 17 and repeat the process: 176 / 21

Moving on to step 3:
21 can be fit into 176 8 times, resulting in a remainder of 8.
Put 8 as the next digit of the answer. 
Result so far: 38.0
Deduct 168 from 176 and we're left with 8.
Grab the next digit (3) from the dividend, add it to 8, then carry on: 83 / 21

Step 4:
If we divide 83 by 21, we get 3 and a remainder of 20.
Put 3 as the next digit of the answer. 
Result so far: 383.0
The remainder is 20 after subtracting 63 from 83.
Grab the next digit (8) from the dividend, add it to 20, then carry on: 208 / 21

Step 5:
The number 21 fits into 208 9 times, leaving a remainder of 19.
Use 9 as the next digit of our solution. 
Result so far: 3839.0
If we take 189 away from 208, we end up with 19.
Grab the next digit (6) from the dividend, add it to 19, then carry on: 196 / 21

On to step 6:
21 goes into 196 9 times with a remainder of 7.
Use 9 as the next digit of our solution. 
Result so far: 38399.0
Deduct 189 from 196 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.

Step 7:
21 can be fit into 70 3 times, resulting in a remainder of 7.
Use 3 as the next digit of our solution. 
Result so far: 38399.3
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.

Going ahead to step 8:
When dividing 70 by 21, we get 3 with a remainder of 7.
The next digit of our result is 3. 
Result so far: 38399.33
The remainder is 7 after subtracting 63 from 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

The quotient of the division is 38399.33, and the remainder is 0.007.