We look at the division of 138378 by 25 
The aim is to understand the frequency of 25 in 138378.

Let's proceed to step 1:
25 can be fit into 1 0 times, resulting in a remainder of 1.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 1, we end up with 1.
Bring next digit (3) of the dividend behind the 1 and repeat the process: 13 / 25

Step 2:
25 goes into 13 0 times with a remainder of 13.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 13 leaves us with 13.
Bring next digit (8) of the dividend behind the 13 and repeat the process: 138 / 25

Let's proceed to step 3:
138 divided by 25 is 5 with a remainder of 13.
The number 5 becomes the next digit in our result. 
Result so far: 5.0
Subtracting 125 from 138 leaves us with 13.
Fetch the next digit (3) from the dividend, attach it to 13 and continue: 133 / 25

Advancing to step 4:
If we divide 133 by 25, we get 5 and a remainder of 8.
The number 5 becomes the next digit in our result. 
Result so far: 55.0
If we take 125 away from 133, we end up with 8.
Append the next digit (7) from the dividend to 8 and continue with: 87 / 25

Step 5:
25 goes into 87 3 times with a remainder of 12.
Record the quotient 3 as the next digit in the result. 
Result so far: 553.0
Subtract 75 from 87 to get 12.
Bring next digit (8) of the dividend behind the 12 and repeat the process: 128 / 25

Step 6:
25 goes into 128 5 times with a remainder of 3.
Write down 5 as next digit of the result. 
Result so far: 5535.0
If we take 125 away from 128, we end up with 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Advancing to step 7:
25 can be fit into 30 1 times, resulting in a remainder of 5.
The number 1 becomes the next digit in our result. 
Result so far: 5535.1
Subtract 25 from 30 to get 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Going ahead to step 8:
25 goes into 50 2 times with a remainder of 0.
Use 2 as the next digit of our solution. 
Result so far: 5535.12
Deduct 50 from 50 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.

Advancing to step 9:
0 divided by 25 is 0 with a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 5535.12
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.

On 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: 5535.12
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.

Our division results in 5535.12 with a remaining 0.0.