We're dividing 513349 by 75 
The aim is to understand the frequency of 75 in 513349.

Step 1:
If we divide 5 by 75, we get 0 and a remainder of 5.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 5, we end up with 5.
Include the next digit (1) from the dividend after 5, then repeat: 51 / 75

Moving on to step 2:
If we divide 51 by 75, we get 0 and a remainder of 51.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 51 and we're left with 51.
Fetch the next digit (3) from the dividend, attach it to 51 and continue: 513 / 75

Moving on to step 3:
If we divide 513 by 75, we get 6 and a remainder of 63.
Record the quotient 6 as the next digit in the result. 
Result so far: 6.0
The remainder is 63 after subtracting 450 from 513.
Bring next digit (3) of the dividend behind the 63 and repeat the process: 633 / 75

Advancing to step 4:
75 goes into 633 8 times with a remainder of 33.
Put 8 as the next digit of the answer. 
Result so far: 68.0
The remainder is 33 after subtracting 600 from 633.
Include the next digit (4) from the dividend after 33, then repeat: 334 / 75

Step 5:
When dividing 334 by 75, we get 4 with a remainder of 34.
The next digit of our result is 4. 
Result so far: 684.0
Subtracting 300 from 334 leaves us with 34.
Bring next digit (9) of the dividend behind the 34 and repeat the process: 349 / 75

Step 6:
349 divided by 75 is 4 with a remainder of 49.
Record the quotient 4 as the next digit in the result. 
Result so far: 6844.0
Deduct 300 from 349 and we're left with 49.
Since there are no more digits in the dividend, we add a zero to the remainder making it 490, and continue the process.

Going ahead to step 7:
If we divide 490 by 75, we get 6 and a remainder of 40.
Write down 6 as next digit of the result. 
Result so far: 6844.6
Subtract 450 from 490 to get 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Going ahead to step 8:
When dividing 400 by 75, we get 5 with a remainder of 25.
Record the quotient 5 as the next digit in the result. 
Result so far: 6844.65
If we take 375 away from 400, we end up 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.

On to step 9:
75 can be fit into 250 3 times, resulting in a remainder of 25.
Use 3 as the next digit of our solution. 
Result so far: 6844.653
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.

Moving on to step 10:
75 can be fit into 250 3 times, resulting in a remainder of 25.
The number 3 becomes the next digit in our result. 
Result so far: 6844.6533
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 6844.6533 and a remainder of 0.00025.