We're dividing 78273291 by 866 
The aim is to understand the frequency of 866 in 78273291.

Step 1:
If we divide 7 by 866, we get 0 and a remainder of 7.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 7 leaves us with 7.
Bring next digit (8) of the dividend behind the 7 and repeat the process: 78 / 866

Let's proceed to step 2:
The number 866 fits into 78 0 times, leaving a remainder of 78.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 78, we end up with 78.
Include the next digit (2) from the dividend after 78, then repeat: 782 / 866

Advancing to step 3:
782 divided by 866 is 0 with a remainder of 782.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 782 to get 782.
Append the next digit (7) from the dividend to 782 and continue with: 7827 / 866

On to step 4:
7827 divided by 866 is 9 with a remainder of 33.
Use 9 as the next digit of our solution. 
Result so far: 9.0
Subtract 7794 from 7827 to get 33.
Fetch the next digit (3) from the dividend, attach it to 33 and continue: 333 / 866

Let's proceed to step 5:
When dividing 333 by 866, we get 0 with a remainder of 333.
Use 0 as the next digit of our solution. 
Result so far: 90.0
If we take 0 away from 333, we end up with 333.
Take the next digit (2) from the dividend and append it to 333, then repeat: 3332 / 866

Advancing to step 6:
866 can be fit into 3332 3 times, resulting in a remainder of 734.
The next digit of our result is 3. 
Result so far: 903.0
Subtracting 2598 from 3332 leaves us with 734.
Bring next digit (9) of the dividend behind the 734 and repeat the process: 7349 / 866

Step 7:
When dividing 7349 by 866, we get 8 with a remainder of 421.
Write down 8 as next digit of the result. 
Result so far: 9038.0
Subtracting 6928 from 7349 leaves us with 421.
Take the next digit (1) from the dividend and append it to 421, then repeat: 4211 / 866

Advancing to step 8:
866 goes into 4211 4 times with a remainder of 747.
The number 4 becomes the next digit in our result. 
Result so far: 90384.0
The remainder is 747 after subtracting 3464 from 4211.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7470, and continue the process.

Moving on to step 9:
7470 divided by 866 is 8 with a remainder of 542.
The number 8 becomes the next digit in our result. 
Result so far: 90384.8
Deduct 6928 from 7470 and we're left with 542.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5420, and continue the process.

Moving on to step 10:
The number 866 fits into 5420 6 times, leaving a remainder of 224.
Put 6 as the next digit of the answer. 
Result so far: 90384.86
If we take 5196 away from 5420, we end up with 224.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2240, and continue the process.

On to step 11:
866 goes into 2240 2 times with a remainder of 508.
Put 2 as the next digit of the answer. 
Result so far: 90384.862
If we subtract 1732 from 2240, we get 508.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5080, and continue the process.

Step 12:
When dividing 5080 by 866, we get 5 with a remainder of 750.
Record the quotient 5 as the next digit in the result. 
Result so far: 90384.8625
If we subtract 4330 from 5080, we get 750.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7500, and continue the process.

Let's proceed to step 13:
The number 866 fits into 7500 8 times, leaving a remainder of 572.
Record the quotient 8 as the next digit in the result. 
Result so far: 90384.86258
Subtracting 6928 from 7500 leaves us with 572.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5720, and continue the process.

Step 14:
When dividing 5720 by 866, we get 6 with a remainder of 524.
The next digit of our result is 6. 
Result so far: 90384.862586
If we subtract 5196 from 5720, we get 524.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5240, and continue the process.

Moving on to step 15:
5240 divided by 866 is 6 with a remainder of 44.
Use 6 as the next digit of our solution. 
Result so far: 90384.8625866
The remainder is 44 after subtracting 5196 from 5240.
Since there are no more digits in the dividend, we add a zero to the remainder making it 440, and continue the process.

Our division results in 90384.8625866 with a remaining 4.4e-07.