We look at the division of 456490 by 25 
We want to figure out the number of times 456490 can be divided by 25.

Step 1:
25 can be fit into 4 0 times, resulting in a remainder of 4.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 4 and we're left with 4.
Append the next digit (5) from the dividend to 4 and continue with: 45 / 25

Going ahead to step 2:
The number 25 fits into 45 1 times, leaving a remainder of 20.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
If we subtract 25 from 45, we get 20.
Include the next digit (6) from the dividend after 20, then repeat: 206 / 25

Step 3:
When dividing 206 by 25, we get 8 with a remainder of 6.
The next digit of our result is 8. 
Result so far: 18.0
Subtracting 200 from 206 leaves us with 6.
Include the next digit (4) from the dividend after 6, then repeat: 64 / 25

On to step 4:
25 goes into 64 2 times with a remainder of 14.
The next digit of our result is 2. 
Result so far: 182.0
The remainder is 14 after subtracting 50 from 64.
Include the next digit (9) from the dividend after 14, then repeat: 149 / 25

Advancing to step 5:
25 goes into 149 5 times with a remainder of 24.
Write down 5 as next digit of the result. 
Result so far: 1825.0
If we subtract 125 from 149, we get 24.
Bring next digit (0) of the dividend behind the 24 and repeat the process: 240 / 25

On to step 6:
The number 25 fits into 240 9 times, leaving a remainder of 15.
The next digit of our result is 9. 
Result so far: 18259.0
Deduct 225 from 240 and we're left with 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Moving on to step 7:
25 can be fit into 150 6 times, resulting in a remainder of 0.
The number 6 becomes the next digit in our result. 
Result so far: 18259.6
Deduct 150 from 150 and we're left with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Moving on to step 8:
When dividing 0 by 25, we get 0 with a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 18259.6
The remainder is 0 after subtracting 0 from 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

On to step 9:
If we divide 0 by 25, we get 0 and a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 18259.6
Subtract 0 from 0 to 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 18259.6, with a leftover of 0.0.