Let's divide 643398 by 25
Let's see how many times 25 fits into 643398.

Advancing to step 1:
25 goes into 6 0 times with a remainder of 6.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 6 leaves us with 6.
Append the next digit (4) from the dividend to 6 and continue with: 64 / 25

Going ahead to step 2:
25 goes into 64 2 times with a remainder of 14.
Use 2 as the next digit of our solution. 
Result so far: 2.0
Subtracting 50 from 64 leaves us with 14.
Include the next digit (3) from the dividend after 14, then repeat: 143 / 25

Going ahead to step 3:
25 can be fit into 143 5 times, resulting in a remainder of 18.
The next digit of our result is 5. 
Result so far: 25.0
Subtract 125 from 143 to get 18.
Bring next digit (3) of the dividend behind the 18 and repeat the process: 183 / 25

On to step 4:
183 divided by 25 is 7 with a remainder of 8.
Record the quotient 7 as the next digit in the result. 
Result so far: 257.0
Deduct 175 from 183 and we're left with 8.
Append the next digit (9) from the dividend to 8 and continue with: 89 / 25

On to step 5:
If we divide 89 by 25, we get 3 and a remainder of 14.
Use 3 as the next digit of our solution. 
Result so far: 2573.0
Subtracting 75 from 89 leaves us with 14.
Append the next digit (8) from the dividend to 14 and continue with: 148 / 25

Advancing to step 6:
The number 25 fits into 148 5 times, leaving a remainder of 23.
The next digit of our result is 5. 
Result so far: 25735.0
If we take 125 away from 148, we end up with 23.
Since there are no more digits in the dividend, we add a zero to the remainder making it 230, and continue the process.

Going ahead to step 7:
25 goes into 230 9 times with a remainder of 5.
The number 9 becomes the next digit in our result. 
Result so far: 25735.9
Deduct 225 from 230 and we're left with 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Step 8:
If we divide 50 by 25, we get 2 and a remainder of 0.
The next digit of our result is 2. 
Result so far: 25735.92
Subtract 50 from 50 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.

Moving on to step 9:
0 divided by 25 is 0 with a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 25735.92
If we take 0 away from 0, we end up 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.

Step 10:
25 can be fit into 0 0 times, resulting in a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 25735.92
If we take 0 away from 0, we end up 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.

After the division, we end up with 25735.92 and a remainder of 0.0.