643116 divided by 25 
Let's see how many times 25 fits into 643116.

Moving on to step 1:
25 goes into 6 0 times with a remainder of 6.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 6 and we're left with 6.
Grab the next digit (4) from the dividend, add it to 6, then carry on: 64 / 25

Moving on to step 2:
64 divided by 25 is 2 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.
Grab the next digit (3) from the dividend, add it to 14, then carry on: 143 / 25

Let's proceed to step 3:
143 divided by 25 is 5 with a remainder of 18.
Write down 5 as next digit of the result. 
Result so far: 25.0
Subtracting 125 from 143 leaves us with 18.
Include the next digit (1) from the dividend after 18, then repeat: 181 / 25

Step 4:
When dividing 181 by 25, we get 7 with a remainder of 6.
Write down 7 as next digit of the result. 
Result so far: 257.0
Subtracting 175 from 181 leaves us with 6.
Take the next digit (1) from the dividend and append it to 6, then repeat: 61 / 25

Step 5:
25 goes into 61 2 times with a remainder of 11.
The next digit of our result is 2. 
Result so far: 2572.0
If we take 50 away from 61, we end up with 11.
Grab the next digit (6) from the dividend, add it to 11, then carry on: 116 / 25

On to step 6:
116 divided by 25 is 4 with a remainder of 16.
Write down 4 as next digit of the result. 
Result so far: 25724.0
If we subtract 100 from 116, we get 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Going ahead to step 7:
If we divide 160 by 25, we get 6 and a remainder of 10.
Write down 6 as next digit of the result. 
Result so far: 25724.6
Deduct 150 from 160 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 8:
When dividing 100 by 25, we get 4 with a remainder of 0.
Put 4 as the next digit of the answer. 
Result so far: 25724.64
If we subtract 100 from 100, 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 9:
If we divide 0 by 25, we get 0 and a remainder of 0.
The next digit of our result is 0. 
Result so far: 25724.64
Subtracting 0 from 0 leaves us 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 10:
0 divided by 25 is 0 with a remainder of 0.
The next digit of our result is 0. 
Result so far: 25724.64
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.

The final outcome is 25724.64, with a leftover of 0.0.