We divide 25409 by 40
Our goal is to divide 25409 by 40.

Going ahead to step 1:
If we divide 2 by 40, we get 0 and a remainder of 2.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 2, we get 2.
Append the next digit (5) from the dividend to 2 and continue with: 25 / 40

Let's proceed to step 2:
The number 40 fits into 25 0 times, leaving a remainder of 25.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 25 to get 25.
Take the next digit (4) from the dividend and append it to 25, then repeat: 254 / 40

On to step 3:
40 goes into 254 6 times with a remainder of 14.
The number 6 becomes the next digit in our result. 
Result so far: 6.0
If we take 240 away from 254, we end up with 14.
Bring next digit (0) of the dividend behind the 14 and repeat the process: 140 / 40

Let's proceed to step 4:
When dividing 140 by 40, we get 3 with a remainder of 20.
Use 3 as the next digit of our solution. 
Result so far: 63.0
The remainder is 20 after subtracting 120 from 140.
Fetch the next digit (9) from the dividend, attach it to 20 and continue: 209 / 40

Moving on to step 5:
209 divided by 40 is 5 with a remainder of 9.
Record the quotient 5 as the next digit in the result. 
Result so far: 635.0
Deduct 200 from 209 and we're left with 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

On to step 6:
If we divide 90 by 40, we get 2 and a remainder of 10.
The number 2 becomes the next digit in our result. 
Result so far: 635.2
Deduct 80 from 90 and we're left with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Moving on to step 7:
40 can be fit into 100 2 times, resulting in a remainder of 20.
Put 2 as the next digit of the answer. 
Result so far: 635.22
If we take 80 away from 100, 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.

The final result is 635.22 with a remainder of 0.02.