81254459 ÷ 375 
The aim is to understand the frequency of 375 in 81254459.

Step 1:
When dividing 8 by 375, we get 0 with a remainder of 8.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 8 to get 8.
Grab the next digit (1) from the dividend, add it to 8, then carry on: 81 / 375

Let's proceed to step 2:
375 goes into 81 0 times with a remainder of 81.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 81 to get 81.
Bring next digit (2) of the dividend behind the 81 and repeat the process: 812 / 375

Going ahead to step 3:
The number 375 fits into 812 2 times, leaving a remainder of 62.
Put 2 as the next digit of the answer. 
Result so far: 2.0
Subtract 750 from 812 to get 62.
Bring next digit (5) of the dividend behind the 62 and repeat the process: 625 / 375

Going ahead to step 4:
The number 375 fits into 625 1 times, leaving a remainder of 250.
Write down 1 as next digit of the result. 
Result so far: 21.0
The remainder is 250 after subtracting 375 from 625.
Take the next digit (4) from the dividend and append it to 250, then repeat: 2504 / 375

Let's proceed to step 5:
375 goes into 2504 6 times with a remainder of 254.
Use 6 as the next digit of our solution. 
Result so far: 216.0
If we take 2250 away from 2504, we end up with 254.
Grab the next digit (4) from the dividend, add it to 254, then carry on: 2544 / 375

Going ahead to step 6:
375 can be fit into 2544 6 times, resulting in a remainder of 294.
Put 6 as the next digit of the answer. 
Result so far: 2166.0
Subtract 2250 from 2544 to get 294.
Grab the next digit (5) from the dividend, add it to 294, then carry on: 2945 / 375

Going ahead to step 7:
If we divide 2945 by 375, we get 7 and a remainder of 320.
Record the quotient 7 as the next digit in the result. 
Result so far: 21667.0
Subtract 2625 from 2945 to get 320.
Append the next digit (9) from the dividend to 320 and continue with: 3209 / 375

On to step 8:
375 goes into 3209 8 times with a remainder of 209.
The next digit of our result is 8. 
Result so far: 216678.0
If we subtract 3000 from 3209, we get 209.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2090, and continue the process.

Let's proceed to step 9:
375 goes into 2090 5 times with a remainder of 215.
Use 5 as the next digit of our solution. 
Result so far: 216678.5
Subtract 1875 from 2090 to get 215.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2150, and continue the process.

Advancing to step 10:
When dividing 2150 by 375, we get 5 with a remainder of 275.
Use 5 as the next digit of our solution. 
Result so far: 216678.55
If we subtract 1875 from 2150, we get 275.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2750, and continue the process.

The final result is 216678.55 with a remainder of 0.275.