12145688 ÷ 325 
The aim is to understand the frequency of 325 in 12145688.

Step 1:
325 can be fit into 1 0 times, resulting in a remainder of 1.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 1, we get 1.
Append the next digit (2) from the dividend to 1 and continue with: 12 / 325

On to step 2:
325 can be fit into 12 0 times, resulting in a remainder of 12.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 12, we end up with 12.
Bring next digit (1) of the dividend behind the 12 and repeat the process: 121 / 325

Moving on to step 3:
When dividing 121 by 325, we get 0 with a remainder of 121.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 121 leaves us with 121.
Fetch the next digit (4) from the dividend, attach it to 121 and continue: 1214 / 325

On to step 4:
1214 divided by 325 is 3 with a remainder of 239.
The next digit of our result is 3. 
Result so far: 3.0
Deduct 975 from 1214 and we're left with 239.
Fetch the next digit (5) from the dividend, attach it to 239 and continue: 2395 / 325

On to step 5:
325 can be fit into 2395 7 times, resulting in a remainder of 120.
The number 7 becomes the next digit in our result. 
Result so far: 37.0
If we take 2275 away from 2395, we end up with 120.
Grab the next digit (6) from the dividend, add it to 120, then carry on: 1206 / 325

Step 6:
If we divide 1206 by 325, we get 3 and a remainder of 231.
Use 3 as the next digit of our solution. 
Result so far: 373.0
If we take 975 away from 1206, we end up with 231.
Bring next digit (8) of the dividend behind the 231 and repeat the process: 2318 / 325

On to step 7:
325 can be fit into 2318 7 times, resulting in a remainder of 43.
The next digit of our result is 7. 
Result so far: 3737.0
Subtracting 2275 from 2318 leaves us with 43.
Take the next digit (8) from the dividend and append it to 43, then repeat: 438 / 325

Moving on to step 8:
The number 325 fits into 438 1 times, leaving a remainder of 113.
Use 1 as the next digit of our solution. 
Result so far: 37371.0
If we take 325 away from 438, we end up with 113.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1130, and continue the process.

Going ahead to step 9:
325 can be fit into 1130 3 times, resulting in a remainder of 155.
Use 3 as the next digit of our solution. 
Result so far: 37371.3
If we take 975 away from 1130, we end up with 155.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1550, and continue the process.

Moving on to step 10:
1550 divided by 325 is 4 with a remainder of 250.
The number 4 becomes the next digit in our result. 
Result so far: 37371.34
Subtracting 1300 from 1550 leaves us with 250.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2500, and continue the process.

Moving on to step 11:
2500 divided by 325 is 7 with a remainder of 225.
Write down 7 as next digit of the result. 
Result so far: 37371.347
Subtracting 2275 from 2500 leaves us with 225.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2250, and continue the process.

On to step 12:
325 goes into 2250 6 times with a remainder of 300.
The next digit of our result is 6. 
Result so far: 37371.3476
Subtracting 1950 from 2250 leaves us with 300.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3000, and continue the process.

Let's proceed to step 13:
If we divide 3000 by 325, we get 9 and a remainder of 75.
Record the quotient 9 as the next digit in the result. 
Result so far: 37371.34769
Subtracting 2925 from 3000 leaves us with 75.
Since there are no more digits in the dividend, we add a zero to the remainder making it 750, and continue the process.

Advancing to step 14:
The number 325 fits into 750 2 times, leaving a remainder of 100.
Write down 2 as next digit of the result. 
Result so far: 37371.347692
If we subtract 650 from 750, we get 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 15:
The number 325 fits into 1000 3 times, leaving a remainder of 25.
Use 3 as the next digit of our solution. 
Result so far: 37371.3476923
Deduct 975 from 1000 and we're left with 25.
Since there are no more digits in the dividend, we add a zero to the remainder making it 250, and continue the process.

Let's proceed to step 16:
325 can be fit into 250 0 times, resulting in a remainder of 250.
The next digit of our result is 0. 
Result so far: 37371.3476923
Subtract 0 from 250 to get 250.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2500, and continue the process.

The final outcome is 37371.3476923, with a leftover of 2.5e-07.