We look at the division of 236543 by 75 
The aim is to understand the frequency of 75 in 236543.

On to step 1:
75 goes into 2 0 times with a remainder of 2.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 2 after subtracting 0 from 2.
Fetch the next digit (3) from the dividend, attach it to 2 and continue: 23 / 75

On to step 2:
If we divide 23 by 75, we get 0 and a remainder of 23.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 23 leaves us with 23.
Append the next digit (6) from the dividend to 23 and continue with: 236 / 75

Going ahead to step 3:
75 can be fit into 236 3 times, resulting in a remainder of 11.
The next digit of our result is 3. 
Result so far: 3.0
If we subtract 225 from 236, we get 11.
Take the next digit (5) from the dividend and append it to 11, then repeat: 115 / 75

Moving on to step 4:
75 can be fit into 115 1 times, resulting in a remainder of 40.
Record the quotient 1 as the next digit in the result. 
Result so far: 31.0
Subtract 75 from 115 to get 40.
Bring next digit (4) of the dividend behind the 40 and repeat the process: 404 / 75

On to step 5:
75 goes into 404 5 times with a remainder of 29.
Use 5 as the next digit of our solution. 
Result so far: 315.0
The remainder is 29 after subtracting 375 from 404.
Append the next digit (3) from the dividend to 29 and continue with: 293 / 75

Going ahead to step 6:
75 goes into 293 3 times with a remainder of 68.
The next digit of our result is 3. 
Result so far: 3153.0
Subtracting 225 from 293 leaves us with 68.
Since there are no more digits in the dividend, we add a zero to the remainder making it 680, and continue the process.

Moving on to step 7:
If we divide 680 by 75, we get 9 and a remainder of 5.
The number 9 becomes the next digit in our result. 
Result so far: 3153.9
Deduct 675 from 680 and we're left with 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Step 8:
50 divided by 75 is 0 with a remainder of 50.
The number 0 becomes the next digit in our result. 
Result so far: 3153.9
Subtract 0 from 50 to get 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

Advancing to step 9:
When dividing 500 by 75, we get 6 with a remainder of 50.
The number 6 becomes the next digit in our result. 
Result so far: 3153.906
Deduct 450 from 500 and we're left with 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

Going ahead to step 10:
500 divided by 75 is 6 with a remainder of 50.
Record the quotient 6 as the next digit in the result. 
Result so far: 3153.9066
If we subtract 450 from 500, we get 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

The quotient of the division is 3153.9066, and the remainder is 0.0005.