We divide 623931 by 25
The aim is to understand the frequency of 25 in 623931.

Let's proceed 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
Deduct 0 from 6 and we're left with 6.
Fetch the next digit (2) from the dividend, attach it to 6 and continue: 62 / 25

Let's proceed to step 2:
If we divide 62 by 25, we get 2 and a remainder of 12.
The number 2 becomes the next digit in our result. 
Result so far: 2.0
Subtract 50 from 62 to get 12.
Grab the next digit (3) from the dividend, add it to 12, then carry on: 123 / 25

Advancing to step 3:
123 divided by 25 is 4 with a remainder of 23.
Put 4 as the next digit of the answer. 
Result so far: 24.0
Deduct 100 from 123 and we're left with 23.
Bring next digit (9) of the dividend behind the 23 and repeat the process: 239 / 25

Let's proceed to step 4:
When dividing 239 by 25, we get 9 with a remainder of 14.
The number 9 becomes the next digit in our result. 
Result so far: 249.0
Deduct 225 from 239 and we're left with 14.
Grab the next digit (3) from the dividend, add it to 14, then carry on: 143 / 25

On to step 5:
When dividing 143 by 25, we get 5 with a remainder of 18.
The next digit of our result is 5. 
Result so far: 2495.0
Deduct 125 from 143 and we're left with 18.
Append the next digit (1) from the dividend to 18 and continue with: 181 / 25

On to step 6:
The number 25 fits into 181 7 times, leaving a remainder of 6.
Write down 7 as next digit of the result. 
Result so far: 24957.0
If we take 175 away from 181, we end up with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Moving on to step 7:
When dividing 60 by 25, we get 2 with a remainder of 10.
Write down 2 as next digit of the result. 
Result so far: 24957.2
If we subtract 50 from 60, we get 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:
25 goes into 100 4 times with a remainder of 0.
Use 4 as the next digit of our solution. 
Result so far: 24957.24
Subtract 100 from 100 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.

Step 9:
If we divide 0 by 25, we get 0 and a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 24957.24
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.

Let's proceed to step 10:
25 can be fit into 0 0 times, resulting in a remainder of 0.
The next digit of our result is 0. 
Result so far: 24957.24
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.

After the division, we end up with 24957.24 and a remainder of 0.0.