815218 divided by 75 
The aim is to understand the frequency of 75 in 815218.

Let's proceed to step 1:
The number 75 fits into 8 0 times, leaving a remainder of 8.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 8 leaves us with 8.
Bring next digit (1) of the dividend behind the 8 and repeat the process: 81 / 75

Going ahead to step 2:
75 goes into 81 1 times with a remainder of 6.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
Subtracting 75 from 81 leaves us with 6.
Append the next digit (5) from the dividend to 6 and continue with: 65 / 75

Advancing to step 3:
65 divided by 75 is 0 with a remainder of 65.
Put 0 as the next digit of the answer. 
Result so far: 10.0
If we take 0 away from 65, we end up with 65.
Fetch the next digit (2) from the dividend, attach it to 65 and continue: 652 / 75

Moving on to step 4:
75 goes into 652 8 times with a remainder of 52.
The number 8 becomes the next digit in our result. 
Result so far: 108.0
If we subtract 600 from 652, we get 52.
Include the next digit (1) from the dividend after 52, then repeat: 521 / 75

On to step 5:
When dividing 521 by 75, we get 6 with a remainder of 71.
Use 6 as the next digit of our solution. 
Result so far: 1086.0
If we subtract 450 from 521, we get 71.
Include the next digit (8) from the dividend after 71, then repeat: 718 / 75

Moving on to step 6:
75 goes into 718 9 times with a remainder of 43.
Write down 9 as next digit of the result. 
Result so far: 10869.0
Subtracting 675 from 718 leaves us with 43.
Since there are no more digits in the dividend, we add a zero to the remainder making it 430, and continue the process.

Step 7:
When dividing 430 by 75, we get 5 with a remainder of 55.
Put 5 as the next digit of the answer. 
Result so far: 10869.5
Deduct 375 from 430 and we're left with 55.
Since there are no more digits in the dividend, we add a zero to the remainder making it 550, and continue the process.

Let's proceed to step 8:
If we divide 550 by 75, we get 7 and a remainder of 25.
Write down 7 as next digit of the result. 
Result so far: 10869.57
Deduct 525 from 550 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.

On to step 9:
If we divide 250 by 75, we get 3 and a remainder of 25.
Put 3 as the next digit of the answer. 
Result so far: 10869.573
The remainder is 25 after subtracting 225 from 250.
Since there are no more digits in the dividend, we add a zero to the remainder making it 250, and continue the process.

Going ahead to step 10:
75 can be fit into 250 3 times, resulting in a remainder of 25.
Write down 3 as next digit of the result. 
Result so far: 10869.5733
If we take 225 away from 250, 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.

After the division, we end up with 10869.5733 and a remainder of 0.00025.