We're dividing 315553 by 75 
The aim is to understand the frequency of 75 in 315553.

On to step 1:
3 divided by 75 is 0 with a remainder of 3.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 3 leaves us with 3.
Include the next digit (1) from the dividend after 3, then repeat: 31 / 75

Step 2:
75 can be fit into 31 0 times, resulting in a remainder of 31.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 31 and we're left with 31.
Fetch the next digit (5) from the dividend, attach it to 31 and continue: 315 / 75

Let's proceed to step 3:
The number 75 fits into 315 4 times, leaving a remainder of 15.
Use 4 as the next digit of our solution. 
Result so far: 4.0
Deduct 300 from 315 and we're left with 15.
Fetch the next digit (5) from the dividend, attach it to 15 and continue: 155 / 75

Advancing to step 4:
75 can be fit into 155 2 times, resulting in a remainder of 5.
Record the quotient 2 as the next digit in the result. 
Result so far: 42.0
Subtracting 150 from 155 leaves us with 5.
Bring next digit (5) of the dividend behind the 5 and repeat the process: 55 / 75

Advancing to step 5:
75 can be fit into 55 0 times, resulting in a remainder of 55.
The number 0 becomes the next digit in our result. 
Result so far: 420.0
The remainder is 55 after subtracting 0 from 55.
Take the next digit (3) from the dividend and append it to 55, then repeat: 553 / 75

Step 6:
75 can be fit into 553 7 times, resulting in a remainder of 28.
Record the quotient 7 as the next digit in the result. 
Result so far: 4207.0
The remainder is 28 after subtracting 525 from 553.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

Going ahead to step 7:
280 divided by 75 is 3 with a remainder of 55.
Use 3 as the next digit of our solution. 
Result so far: 4207.3
If we subtract 225 from 280, we get 55.
Since there are no more digits in the dividend, we add a zero to the remainder making it 550, and continue the process.

On to step 8:
If we divide 550 by 75, we get 7 and a remainder of 25.
The number 7 becomes the next digit in our result. 
Result so far: 4207.37
Subtracting 525 from 550 leaves us 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.

Advancing to step 9:
75 can be fit into 250 3 times, resulting in a remainder of 25.
Put 3 as the next digit of the answer. 
Result so far: 4207.373
Deduct 225 from 250 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.

Advancing to step 10:
When dividing 250 by 75, we get 3 with a remainder of 25.
Record the quotient 3 as the next digit in the result. 
Result so far: 4207.3733
Subtract 225 from 250 to get 25.
Since there are no more digits in the dividend, we add a zero to the remainder making it 250, and continue the process.

After the division, we end up with 4207.3733 and a remainder of 0.00025.