Let's divide 406448 by 21
We want to divide 406448 by 21.

Let's proceed to step 1:
21 goes into 4 0 times with a remainder of 4.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 4 to get 4.
Fetch the next digit (0) from the dividend, attach it to 4 and continue: 40 / 21

Step 2:
21 goes into 40 1 times with a remainder of 19.
Use 1 as the next digit of our solution. 
Result so far: 1.0
If we subtract 21 from 40, we get 19.
Bring next digit (6) of the dividend behind the 19 and repeat the process: 196 / 21

Advancing to step 3:
If we divide 196 by 21, we get 9 and a remainder of 7.
Record the quotient 9 as the next digit in the result. 
Result so far: 19.0
If we take 189 away from 196, we end up with 7.
Append the next digit (4) from the dividend to 7 and continue with: 74 / 21

Step 4:
If we divide 74 by 21, we get 3 and a remainder of 11.
The next digit of our result is 3. 
Result so far: 193.0
If we subtract 63 from 74, we get 11.
Append the next digit (4) from the dividend to 11 and continue with: 114 / 21

Moving on to step 5:
21 goes into 114 5 times with a remainder of 9.
Use 5 as the next digit of our solution. 
Result so far: 1935.0
Deduct 105 from 114 and we're left with 9.
Grab the next digit (8) from the dividend, add it to 9, then carry on: 98 / 21

Advancing to step 6:
98 divided by 21 is 4 with a remainder of 14.
The next digit of our result is 4. 
Result so far: 19354.0
Deduct 84 from 98 and we're left with 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

On to step 7:
If we divide 140 by 21, we get 6 and a remainder of 14.
Put 6 as the next digit of the answer. 
Result so far: 19354.6
Deduct 126 from 140 and we're left with 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Moving on to step 8:
21 goes into 140 6 times with a remainder of 14.
Write down 6 as next digit of the result. 
Result so far: 19354.66
The remainder is 14 after subtracting 126 from 140.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

The final outcome is 19354.66, with a leftover of 0.014.