We divide 54395209 by 25
The aim is to understand the frequency of 25 in 54395209.

Advancing to step 1:
When dividing 5 by 25, we get 0 with a remainder of 5.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 5 after subtracting 0 from 5.
Append the next digit (4) from the dividend to 5 and continue with: 54 / 25

Advancing to step 2:
The number 25 fits into 54 2 times, leaving a remainder of 4.
Use 2 as the next digit of our solution. 
Result so far: 2.0
Subtracting 50 from 54 leaves us with 4.
Bring next digit (3) of the dividend behind the 4 and repeat the process: 43 / 25

Moving on to step 3:
When dividing 43 by 25, we get 1 with a remainder of 18.
Record the quotient 1 as the next digit in the result. 
Result so far: 21.0
If we subtract 25 from 43, we get 18.
Append the next digit (9) from the dividend to 18 and continue with: 189 / 25

Moving on to step 4:
25 can be fit into 189 7 times, resulting in a remainder of 14.
The number 7 becomes the next digit in our result. 
Result so far: 217.0
If we take 175 away from 189, we end up with 14.
Append the next digit (5) from the dividend to 14 and continue with: 145 / 25

Going ahead to step 5:
If we divide 145 by 25, we get 5 and a remainder of 20.
Write down 5 as next digit of the result. 
Result so far: 2175.0
If we subtract 125 from 145, we get 20.
Grab the next digit (2) from the dividend, add it to 20, then carry on: 202 / 25

On to step 6:
202 divided by 25 is 8 with a remainder of 2.
Write down 8 as next digit of the result. 
Result so far: 21758.0
The remainder is 2 after subtracting 200 from 202.
Grab the next digit (0) from the dividend, add it to 2, then carry on: 20 / 25

Step 7:
The number 25 fits into 20 0 times, leaving a remainder of 20.
The number 0 becomes the next digit in our result. 
Result so far: 217580.0
Subtracting 0 from 20 leaves us with 20.
Fetch the next digit (9) from the dividend, attach it to 20 and continue: 209 / 25

Step 8:
The number 25 fits into 209 8 times, leaving a remainder of 9.
Record the quotient 8 as the next digit in the result. 
Result so far: 2175808.0
If we subtract 200 from 209, we get 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Moving on to step 9:
25 goes into 90 3 times with a remainder of 15.
Put 3 as the next digit of the answer. 
Result so far: 2175808.3
Subtracting 75 from 90 leaves us with 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Going ahead to step 10:
25 goes into 150 6 times with a remainder of 0.
The number 6 becomes the next digit in our result. 
Result so far: 2175808.36
The remainder is 0 after subtracting 150 from 150.
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 11:
25 goes into 0 0 times with a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 2175808.36
The remainder is 0 after subtracting 0 from 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 12:
If we divide 0 by 25, we get 0 and a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 2175808.36
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 quotient of the division is 2175808.36, and the remainder is 0.0.