We look at the division of 87034233 by 866 
The aim is to understand the frequency of 866 in 87034233.

Going ahead to step 1:
866 goes into 8 0 times with a remainder of 8.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 8 after subtracting 0 from 8.
Take the next digit (7) from the dividend and append it to 8, then repeat: 87 / 866

Step 2:
If we divide 87 by 866, we get 0 and a remainder of 87.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 87 and we're left with 87.
Take the next digit (0) from the dividend and append it to 87, then repeat: 870 / 866

Let's proceed to step 3:
If we divide 870 by 866, we get 1 and a remainder of 4.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
Deduct 866 from 870 and we're left with 4.
Fetch the next digit (3) from the dividend, attach it to 4 and continue: 43 / 866

Let's proceed to step 4:
When dividing 43 by 866, we get 0 with a remainder of 43.
Put 0 as the next digit of the answer. 
Result so far: 10.0
The remainder is 43 after subtracting 0 from 43.
Include the next digit (4) from the dividend after 43, then repeat: 434 / 866

On to step 5:
The number 866 fits into 434 0 times, leaving a remainder of 434.
Use 0 as the next digit of our solution. 
Result so far: 100.0
Subtracting 0 from 434 leaves us with 434.
Include the next digit (2) from the dividend after 434, then repeat: 4342 / 866

On to step 6:
The number 866 fits into 4342 5 times, leaving a remainder of 12.
Use 5 as the next digit of our solution. 
Result so far: 1005.0
The remainder is 12 after subtracting 4330 from 4342.
Take the next digit (3) from the dividend and append it to 12, then repeat: 123 / 866

On to step 7:
866 can be fit into 123 0 times, resulting in a remainder of 123.
Put 0 as the next digit of the answer. 
Result so far: 10050.0
The remainder is 123 after subtracting 0 from 123.
Take the next digit (3) from the dividend and append it to 123, then repeat: 1233 / 866

Advancing to step 8:
1233 divided by 866 is 1 with a remainder of 367.
Write down 1 as next digit of the result. 
Result so far: 100501.0
The remainder is 367 after subtracting 866 from 1233.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3670, and continue the process.

Advancing to step 9:
3670 divided by 866 is 4 with a remainder of 206.
Use 4 as the next digit of our solution. 
Result so far: 100501.4
Subtracting 3464 from 3670 leaves us with 206.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2060, and continue the process.

On to step 10:
2060 divided by 866 is 2 with a remainder of 328.
Write down 2 as next digit of the result. 
Result so far: 100501.42
The remainder is 328 after subtracting 1732 from 2060.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3280, and continue the process.

On to step 11:
When dividing 3280 by 866, we get 3 with a remainder of 682.
Put 3 as the next digit of the answer. 
Result so far: 100501.423
If we take 2598 away from 3280, we end up with 682.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6820, and continue the process.

Advancing to step 12:
866 goes into 6820 7 times with a remainder of 758.
Put 7 as the next digit of the answer. 
Result so far: 100501.4237
Subtracting 6062 from 6820 leaves us with 758.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7580, and continue the process.

Let's proceed to step 13:
The number 866 fits into 7580 8 times, leaving a remainder of 652.
Put 8 as the next digit of the answer. 
Result so far: 100501.42378
Subtract 6928 from 7580 to get 652.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6520, and continue the process.

Going ahead to step 14:
When dividing 6520 by 866, we get 7 with a remainder of 458.
Write down 7 as next digit of the result. 
Result so far: 100501.423787
Deduct 6062 from 6520 and we're left with 458.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4580, and continue the process.

Let's proceed to step 15:
The number 866 fits into 4580 5 times, leaving a remainder of 250.
Record the quotient 5 as the next digit in the result. 
Result so far: 100501.4237875
Subtract 4330 from 4580 to get 250.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2500, and continue the process.

Let's proceed to step 16:
The number 866 fits into 2500 2 times, leaving a remainder of 768.
Write down 2 as next digit of the result. 
Result so far: 100501.42378752
If we subtract 1732 from 2500, we get 768.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7680, and continue the process.

After the division, we end up with 100501.42378752 and a remainder of 7.68e-07.