We're dividing 75312187 by 866 
The aim is to understand the frequency of 866 in 75312187.

Let's proceed to step 1:
7 divided by 866 is 0 with a remainder of 7.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 7 after subtracting 0 from 7.
Include the next digit (5) from the dividend after 7, then repeat: 75 / 866

Step 2:
If we divide 75 by 866, we get 0 and a remainder of 75.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 75 to get 75.
Append the next digit (3) from the dividend to 75 and continue with: 753 / 866

Going ahead to step 3:
866 goes into 753 0 times with a remainder of 753.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 753 after subtracting 0 from 753.
Append the next digit (1) from the dividend to 753 and continue with: 7531 / 866

Advancing to step 4:
7531 divided by 866 is 8 with a remainder of 603.
Write down 8 as next digit of the result. 
Result so far: 8.0
Subtract 6928 from 7531 to get 603.
Bring next digit (2) of the dividend behind the 603 and repeat the process: 6032 / 866

Step 5:
The number 866 fits into 6032 6 times, leaving a remainder of 836.
Use 6 as the next digit of our solution. 
Result so far: 86.0
Subtract 5196 from 6032 to get 836.
Append the next digit (1) from the dividend to 836 and continue with: 8361 / 866

On to step 6:
866 goes into 8361 9 times with a remainder of 567.
Use 9 as the next digit of our solution. 
Result so far: 869.0
If we take 7794 away from 8361, we end up with 567.
Grab the next digit (8) from the dividend, add it to 567, then carry on: 5678 / 866

Going ahead to step 7:
866 goes into 5678 6 times with a remainder of 482.
The next digit of our result is 6. 
Result so far: 8696.0
Deduct 5196 from 5678 and we're left with 482.
Fetch the next digit (7) from the dividend, attach it to 482 and continue: 4827 / 866

Going ahead to step 8:
The number 866 fits into 4827 5 times, leaving a remainder of 497.
Use 5 as the next digit of our solution. 
Result so far: 86965.0
Deduct 4330 from 4827 and we're left with 497.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4970, and continue the process.

Going ahead to step 9:
866 can be fit into 4970 5 times, resulting in a remainder of 640.
The next digit of our result is 5. 
Result so far: 86965.5
Subtract 4330 from 4970 to get 640.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6400, and continue the process.

Going ahead to step 10:
6400 divided by 866 is 7 with a remainder of 338.
The number 7 becomes the next digit in our result. 
Result so far: 86965.57
The remainder is 338 after subtracting 6062 from 6400.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3380, and continue the process.

Step 11:
If we divide 3380 by 866, we get 3 and a remainder of 782.
Record the quotient 3 as the next digit in the result. 
Result so far: 86965.573
If we take 2598 away from 3380, we end up with 782.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7820, and continue the process.

Going ahead to step 12:
When dividing 7820 by 866, we get 9 with a remainder of 26.
Put 9 as the next digit of the answer. 
Result so far: 86965.5739
Subtracting 7794 from 7820 leaves us with 26.
Since there are no more digits in the dividend, we add a zero to the remainder making it 260, and continue the process.

Advancing to step 13:
866 goes into 260 0 times with a remainder of 260.
The next digit of our result is 0. 
Result so far: 86965.5739
If we subtract 0 from 260, we get 260.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2600, and continue the process.

Let's proceed to step 14:
866 goes into 2600 3 times with a remainder of 2.
Write down 3 as next digit of the result. 
Result so far: 86965.573903
If we take 2598 away from 2600, we end up with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Advancing to step 15:
When dividing 20 by 866, we get 0 with a remainder of 20.
Write down 0 as next digit of the result. 
Result so far: 86965.573903
The remainder is 20 after subtracting 0 from 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

On to step 16:
The number 866 fits into 200 0 times, leaving a remainder of 200.
The next digit of our result is 0. 
Result so far: 86965.573903
The remainder is 200 after subtracting 0 from 200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2000, and continue the process.

In conclusion, the division gives 86965.573903 with a balance of 2e-07.