18400404 ÷ 425 
The aim is to understand the frequency of 425 in 18400404.

Advancing to step 1:
425 goes into 1 0 times with a remainder of 1.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 1, we get 1.
Append the next digit (8) from the dividend to 1 and continue with: 18 / 425

Step 2:
When dividing 18 by 425, we get 0 with a remainder of 18.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 18, we end up with 18.
Fetch the next digit (4) from the dividend, attach it to 18 and continue: 184 / 425

Let's proceed to step 3:
If we divide 184 by 425, we get 0 and a remainder of 184.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 184, we end up with 184.
Bring next digit (0) of the dividend behind the 184 and repeat the process: 1840 / 425

On to step 4:
When dividing 1840 by 425, we get 4 with a remainder of 140.
Write down 4 as next digit of the result. 
Result so far: 4.0
If we take 1700 away from 1840, we end up with 140.
Include the next digit (0) from the dividend after 140, then repeat: 1400 / 425

Moving on to step 5:
The number 425 fits into 1400 3 times, leaving a remainder of 125.
The number 3 becomes the next digit in our result. 
Result so far: 43.0
Deduct 1275 from 1400 and we're left with 125.
Bring next digit (4) of the dividend behind the 125 and repeat the process: 1254 / 425

Step 6:
1254 divided by 425 is 2 with a remainder of 404.
The next digit of our result is 2. 
Result so far: 432.0
Subtracting 850 from 1254 leaves us with 404.
Include the next digit (0) from the dividend after 404, then repeat: 4040 / 425

Step 7:
425 can be fit into 4040 9 times, resulting in a remainder of 215.
Use 9 as the next digit of our solution. 
Result so far: 4329.0
Subtracting 3825 from 4040 leaves us with 215.
Fetch the next digit (4) from the dividend, attach it to 215 and continue: 2154 / 425

Moving on to step 8:
425 can be fit into 2154 5 times, resulting in a remainder of 29.
Use 5 as the next digit of our solution. 
Result so far: 43295.0
The remainder is 29 after subtracting 2125 from 2154.
Since there are no more digits in the dividend, we add a zero to the remainder making it 290, and continue the process.

Let's proceed to step 9:
290 divided by 425 is 0 with a remainder of 290.
The next digit of our result is 0. 
Result so far: 43295.0
Deduct 0 from 290 and we're left with 290.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2900, and continue the process.

Moving on to step 10:
425 can be fit into 2900 6 times, resulting in a remainder of 350.
Put 6 as the next digit of the answer. 
Result so far: 43295.06
Deduct 2550 from 2900 and we're left with 350.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3500, and continue the process.

Advancing to step 11:
If we divide 3500 by 425, we get 8 and a remainder of 100.
Write down 8 as next digit of the result. 
Result so far: 43295.068
Subtracting 3400 from 3500 leaves us with 100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1000, and continue the process.

Advancing to step 12:
If we divide 1000 by 425, we get 2 and a remainder of 150.
The next digit of our result is 2. 
Result so far: 43295.0682
Deduct 850 from 1000 and we're left with 150.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1500, and continue the process.

Let's proceed to step 13:
When dividing 1500 by 425, we get 3 with a remainder of 225.
The next digit of our result is 3. 
Result so far: 43295.06823
Subtract 1275 from 1500 to get 225.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2250, and continue the process.

Going ahead to step 14:
When dividing 2250 by 425, we get 5 with a remainder of 125.
Record the quotient 5 as the next digit in the result. 
Result so far: 43295.068235
Deduct 2125 from 2250 and we're left with 125.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1250, and continue the process.

On to step 15:
425 goes into 1250 2 times with a remainder of 400.
The number 2 becomes the next digit in our result. 
Result so far: 43295.0682352
Subtract 850 from 1250 to get 400.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4000, and continue the process.

Going ahead to step 16:
4000 divided by 425 is 9 with a remainder of 175.
The number 9 becomes the next digit in our result. 
Result so far: 43295.06823529
Deduct 3825 from 4000 and we're left with 175.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1750, and continue the process.

In conclusion, the division gives 43295.06823529 with a balance of 1.75e-07.