Let's divide 514991 by 25
The aim is to understand the frequency of 25 in 514991.

On to step 1:
When dividing 5 by 25, we get 0 with a remainder of 5.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 5 after subtracting 0 from 5.
Append the next digit (1) from the dividend to 5 and continue with: 51 / 25

Moving on to step 2:
The number 25 fits into 51 2 times, leaving a remainder of 1.
Write down 2 as next digit of the result. 
Result so far: 2.0
Subtracting 50 from 51 leaves us with 1.
Append the next digit (4) from the dividend to 1 and continue with: 14 / 25

Step 3:
The number 25 fits into 14 0 times, leaving a remainder of 14.
Record the quotient 0 as the next digit in the result. 
Result so far: 20.0
The remainder is 14 after subtracting 0 from 14.
Grab the next digit (9) from the dividend, add it to 14, then carry on: 149 / 25

Going ahead to step 4:
25 goes into 149 5 times with a remainder of 24.
Write down 5 as next digit of the result. 
Result so far: 205.0
Subtracting 125 from 149 leaves us with 24.
Bring next digit (9) of the dividend behind the 24 and repeat the process: 249 / 25

On to step 5:
The number 25 fits into 249 9 times, leaving a remainder of 24.
Write down 9 as next digit of the result. 
Result so far: 2059.0
Subtracting 225 from 249 leaves us with 24.
Include the next digit (1) from the dividend after 24, then repeat: 241 / 25

Going ahead to step 6:
If we divide 241 by 25, we get 9 and a remainder of 16.
Write down 9 as next digit of the result. 
Result so far: 20599.0
If we subtract 225 from 241, 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.

Let's proceed to step 7:
The number 25 fits into 160 6 times, leaving a remainder of 10.
Use 6 as the next digit of our solution. 
Result so far: 20599.6
Subtracting 150 from 160 leaves us 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.

Advancing to step 8:
100 divided by 25 is 4 with a remainder of 0.
Write down 4 as next digit of the result. 
Result so far: 20599.64
Subtracting 100 from 100 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 9:
25 can be fit into 0 0 times, resulting in a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 20599.64
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.

Let's proceed to step 10:
The number 25 fits into 0 0 times, leaving a remainder of 0.
The next digit of our result is 0. 
Result so far: 20599.64
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.

After the division, we end up with 20599.64 and a remainder of 0.0.