Let's divide 253902 by 40
We want to figure out the number of times 253902 can be divided by 40.

Moving on to step 1:
The number 40 fits into 2 0 times, leaving a remainder of 2.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 2 to get 2.
Include the next digit (5) from the dividend after 2, then repeat: 25 / 40

Step 2:
If we divide 25 by 40, we get 0 and a remainder of 25.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 25, we get 25.
Take the next digit (3) from the dividend and append it to 25, then repeat: 253 / 40

Moving on to step 3:
40 can be fit into 253 6 times, resulting in a remainder of 13.
The next digit of our result is 6. 
Result so far: 6.0
If we subtract 240 from 253, we get 13.
Grab the next digit (9) from the dividend, add it to 13, then carry on: 139 / 40

Moving on to step 4:
40 goes into 139 3 times with a remainder of 19.
The next digit of our result is 3. 
Result so far: 63.0
If we subtract 120 from 139, we get 19.
Bring next digit (0) of the dividend behind the 19 and repeat the process: 190 / 40

On to step 5:
40 goes into 190 4 times with a remainder of 30.
Record the quotient 4 as the next digit in the result. 
Result so far: 634.0
Deduct 160 from 190 and we're left with 30.
Take the next digit (2) from the dividend and append it to 30, then repeat: 302 / 40

Advancing to step 6:
302 divided by 40 is 7 with a remainder of 22.
The next digit of our result is 7. 
Result so far: 6347.0
If we take 280 away from 302, we end up with 22.
Since there are no more digits in the dividend, we add a zero to the remainder making it 220, and continue the process.

On to step 7:
40 can be fit into 220 5 times, resulting in a remainder of 20.
Record the quotient 5 as the next digit in the result. 
Result so far: 6347.5
Subtracting 200 from 220 leaves us 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.

Let's proceed to step 8:
200 divided by 40 is 5 with a remainder of 0.
Write down 5 as next digit of the result. 
Result so far: 6347.55
If we subtract 200 from 200, we get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

The final outcome is 6347.55, with a leftover of 0.0.