We divide 661920 by 25
We want to figure out the number of times 661920 can be divided by 25.

Advancing to step 1:
25 can be fit into 6 0 times, resulting in a remainder of 6.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 6 after subtracting 0 from 6.
Append the next digit (6) from the dividend to 6 and continue with: 66 / 25

Advancing to step 2:
If we divide 66 by 25, we get 2 and a remainder of 16.
Write down 2 as next digit of the result. 
Result so far: 2.0
Subtracting 50 from 66 leaves us with 16.
Bring next digit (1) of the dividend behind the 16 and repeat the process: 161 / 25

Going ahead to step 3:
161 divided by 25 is 6 with a remainder of 11.
Put 6 as the next digit of the answer. 
Result so far: 26.0
Subtract 150 from 161 to get 11.
Include the next digit (9) from the dividend after 11, then repeat: 119 / 25

Let's proceed to step 4:
If we divide 119 by 25, we get 4 and a remainder of 19.
Use 4 as the next digit of our solution. 
Result so far: 264.0
If we subtract 100 from 119, we get 19.
Fetch the next digit (2) from the dividend, attach it to 19 and continue: 192 / 25

Step 5:
25 goes into 192 7 times with a remainder of 17.
Use 7 as the next digit of our solution. 
Result so far: 2647.0
If we take 175 away from 192, we end up with 17.
Grab the next digit (0) from the dividend, add it to 17, then carry on: 170 / 25

Going ahead to step 6:
When dividing 170 by 25, we get 6 with a remainder of 20.
Record the quotient 6 as the next digit in the result. 
Result so far: 26476.0
Subtract 150 from 170 to get 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

On to step 7:
If we divide 200 by 25, we get 8 and a remainder of 0.
The number 8 becomes the next digit in our result. 
Result so far: 26476.8
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.

Step 8:
When dividing 0 by 25, we get 0 with a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 26476.8
Deduct 0 from 0 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.

Going ahead to step 9:
The number 25 fits into 0 0 times, leaving a remainder of 0.
The next digit of our result is 0. 
Result so far: 26476.8
If we subtract 0 from 0, 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.

After the division, we end up with 26476.8 and a remainder of 0.0.