We're dividing 408424 by 24 
Let's see how many times 24 fits into 408424.

Step 1:
If we divide 4 by 24, we get 0 and a remainder of 4.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 4 and we're left with 4.
Fetch the next digit (0) from the dividend, attach it to 4 and continue: 40 / 24

Advancing to step 2:
24 goes into 40 1 times with a remainder of 16.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
The remainder is 16 after subtracting 24 from 40.
Bring next digit (8) of the dividend behind the 16 and repeat the process: 168 / 24

Advancing to step 3:
168 divided by 24 is 7 with a remainder of 0.
Put 7 as the next digit of the answer. 
Result so far: 17.0
If we subtract 168 from 168, we get 0.
Fetch the next digit (4) from the dividend, attach it to 0 and continue: 4 / 24

On to step 4:
24 can be fit into 4 0 times, resulting in a remainder of 4.
The number 0 becomes the next digit in our result. 
Result so far: 170.0
Subtracting 0 from 4 leaves us with 4.
Append the next digit (2) from the dividend to 4 and continue with: 42 / 24

Advancing to step 5:
42 divided by 24 is 1 with a remainder of 18.
Put 1 as the next digit of the answer. 
Result so far: 1701.0
Deduct 24 from 42 and we're left with 18.
Grab the next digit (4) from the dividend, add it to 18, then carry on: 184 / 24

Step 6:
The number 24 fits into 184 7 times, leaving a remainder of 16.
Record the quotient 7 as the next digit in the result. 
Result so far: 17017.0
If we subtract 168 from 184, we get 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Advancing to step 7:
If we divide 160 by 24, we get 6 and a remainder of 16.
Record the quotient 6 as the next digit in the result. 
Result so far: 17017.6
The remainder is 16 after subtracting 144 from 160.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

On to step 8:
When dividing 160 by 24, we get 6 with a remainder of 16.
Put 6 as the next digit of the answer. 
Result so far: 17017.66
Deduct 144 from 160 and we're left with 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

After the division, we end up with 17017.66 and a remainder of 0.016.