We're dividing 37821157 by 25 
The aim is to understand the frequency of 25 in 37821157.

On to step 1:
3 divided by 25 is 0 with a remainder of 3.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 3, we get 3.
Bring next digit (7) of the dividend behind the 3 and repeat the process: 37 / 25

On to step 2:
37 divided by 25 is 1 with a remainder of 12.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
If we take 25 away from 37, we end up with 12.
Grab the next digit (8) from the dividend, add it to 12, then carry on: 128 / 25

Step 3:
When dividing 128 by 25, we get 5 with a remainder of 3.
Use 5 as the next digit of our solution. 
Result so far: 15.0
Subtracting 125 from 128 leaves us with 3.
Fetch the next digit (2) from the dividend, attach it to 3 and continue: 32 / 25

Going ahead to step 4:
25 goes into 32 1 times with a remainder of 7.
The number 1 becomes the next digit in our result. 
Result so far: 151.0
Subtract 25 from 32 to get 7.
Fetch the next digit (1) from the dividend, attach it to 7 and continue: 71 / 25

Moving on to step 5:
If we divide 71 by 25, we get 2 and a remainder of 21.
Write down 2 as next digit of the result. 
Result so far: 1512.0
Subtracting 50 from 71 leaves us with 21.
Take the next digit (1) from the dividend and append it to 21, then repeat: 211 / 25

Going ahead to step 6:
The number 25 fits into 211 8 times, leaving a remainder of 11.
Record the quotient 8 as the next digit in the result. 
Result so far: 15128.0
The remainder is 11 after subtracting 200 from 211.
Include the next digit (5) from the dividend after 11, then repeat: 115 / 25

Let's proceed to step 7:
115 divided by 25 is 4 with a remainder of 15.
The number 4 becomes the next digit in our result. 
Result so far: 151284.0
Subtract 100 from 115 to get 15.
Take the next digit (7) from the dividend and append it to 15, then repeat: 157 / 25

Let's proceed to step 8:
157 divided by 25 is 6 with a remainder of 7.
Use 6 as the next digit of our solution. 
Result so far: 1512846.0
Subtract 150 from 157 to get 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

Step 9:
25 can be fit into 70 2 times, resulting in a remainder of 20.
Write down 2 as next digit of the result. 
Result so far: 1512846.2
Subtract 50 from 70 to get 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Step 10:
The number 25 fits into 200 8 times, leaving a remainder of 0.
Write down 8 as next digit of the result. 
Result so far: 1512846.28
Subtracting 200 from 200 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.

Step 11:
25 goes into 0 0 times with a remainder of 0.
The next digit of our result is 0. 
Result so far: 1512846.28
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.

Step 12:
0 divided by 25 is 0 with a remainder of 0.
The next digit of our result is 0. 
Result so far: 1512846.28
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 1512846.28 and a remainder of 0.0.