403154 ÷ 25 
The aim is to understand the frequency of 25 in 403154.

Advancing to step 1:
The number 25 fits into 4 0 times, leaving a remainder of 4.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 4 and we're left with 4.
Fetch the next digit (0) from the dividend, attach it to 4 and continue: 40 / 25

Step 2:
40 divided by 25 is 1 with a remainder of 15.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
If we subtract 25 from 40, we get 15.
Fetch the next digit (3) from the dividend, attach it to 15 and continue: 153 / 25

Step 3:
If we divide 153 by 25, we get 6 and a remainder of 3.
Record the quotient 6 as the next digit in the result. 
Result so far: 16.0
If we subtract 150 from 153, we get 3.
Fetch the next digit (1) from the dividend, attach it to 3 and continue: 31 / 25

Going ahead to step 4:
If we divide 31 by 25, we get 1 and a remainder of 6.
Record the quotient 1 as the next digit in the result. 
Result so far: 161.0
Subtract 25 from 31 to get 6.
Fetch the next digit (5) from the dividend, attach it to 6 and continue: 65 / 25

Moving on to step 5:
65 divided by 25 is 2 with a remainder of 15.
Put 2 as the next digit of the answer. 
Result so far: 1612.0
Subtract 50 from 65 to get 15.
Take the next digit (4) from the dividend and append it to 15, then repeat: 154 / 25

Advancing to step 6:
25 can be fit into 154 6 times, resulting in a remainder of 4.
The next digit of our result is 6. 
Result so far: 16126.0
If we subtract 150 from 154, we get 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Step 7:
25 can be fit into 40 1 times, resulting in a remainder of 15.
Use 1 as the next digit of our solution. 
Result so far: 16126.1
Subtract 25 from 40 to get 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

On to step 8:
When dividing 150 by 25, we get 6 with a remainder of 0.
The next digit of our result is 6. 
Result so far: 16126.16
Deduct 150 from 150 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.

Moving on to step 9:
25 can be fit into 0 0 times, resulting in a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 16126.16
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 10:
0 divided by 25 is 0 with a remainder of 0.
The next digit of our result is 0. 
Result so far: 16126.16
Subtracting 0 from 0 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.

The final outcome is 16126.16, with a leftover of 0.0.