We divide 7003509 by 866
The aim is to understand the frequency of 866 in 7003509.

Moving on to step 1:
If we divide 7 by 866, we get 0 and a remainder of 7.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 7, we end up with 7.
Grab the next digit (0) from the dividend, add it to 7, then carry on: 70 / 866

On to step 2:
When dividing 70 by 866, we get 0 with a remainder of 70.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 70, we get 70.
Append the next digit (0) from the dividend to 70 and continue with: 700 / 866

Let's proceed to step 3:
700 divided by 866 is 0 with a remainder of 700.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 700 to get 700.
Grab the next digit (3) from the dividend, add it to 700, then carry on: 7003 / 866

Advancing to step 4:
866 can be fit into 7003 8 times, resulting in a remainder of 75.
Use 8 as the next digit of our solution. 
Result so far: 8.0
Subtracting 6928 from 7003 leaves us with 75.
Bring next digit (5) of the dividend behind the 75 and repeat the process: 755 / 866

Step 5:
The number 866 fits into 755 0 times, leaving a remainder of 755.
Write down 0 as next digit of the result. 
Result so far: 80.0
Deduct 0 from 755 and we're left with 755.
Take the next digit (0) from the dividend and append it to 755, then repeat: 7550 / 866

Going ahead to step 6:
866 goes into 7550 8 times with a remainder of 622.
The next digit of our result is 8. 
Result so far: 808.0
Subtract 6928 from 7550 to get 622.
Include the next digit (9) from the dividend after 622, then repeat: 6229 / 866

Step 7:
If we divide 6229 by 866, we get 7 and a remainder of 167.
The next digit of our result is 7. 
Result so far: 8087.0
Subtracting 6062 from 6229 leaves us with 167.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1670, and continue the process.

Step 8:
If we divide 1670 by 866, we get 1 and a remainder of 804.
Record the quotient 1 as the next digit in the result. 
Result so far: 8087.1
Subtracting 866 from 1670 leaves us with 804.
Since there are no more digits in the dividend, we add a zero to the remainder making it 8040, and continue the process.

Let's proceed to step 9:
866 can be fit into 8040 9 times, resulting in a remainder of 246.
Record the quotient 9 as the next digit in the result. 
Result so far: 8087.19
Deduct 7794 from 8040 and we're left with 246.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2460, and continue the process.

Moving on to step 10:
The number 866 fits into 2460 2 times, leaving a remainder of 728.
The next digit of our result is 2. 
Result so far: 8087.192
Subtract 1732 from 2460 to get 728.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7280, and continue the process.

On to step 11:
866 goes into 7280 8 times with a remainder of 352.
The next digit of our result is 8. 
Result so far: 8087.1928
If we subtract 6928 from 7280, we get 352.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3520, and continue the process.

On to step 12:
866 goes into 3520 4 times with a remainder of 56.
The next digit of our result is 4. 
Result so far: 8087.19284
Subtracting 3464 from 3520 leaves us with 56.
Since there are no more digits in the dividend, we add a zero to the remainder making it 560, and continue the process.

Going ahead to step 13:
560 divided by 866 is 0 with a remainder of 560.
Use 0 as the next digit of our solution. 
Result so far: 8087.19284
Subtracting 0 from 560 leaves us with 560.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5600, and continue the process.

Step 14:
If we divide 5600 by 866, we get 6 and a remainder of 404.
Use 6 as the next digit of our solution. 
Result so far: 8087.1928406
Deduct 5196 from 5600 and we're left with 404.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4040, and continue the process.

Going ahead to step 15:
When dividing 4040 by 866, we get 4 with a remainder of 576.
The number 4 becomes the next digit in our result. 
Result so far: 8087.19284064
Deduct 3464 from 4040 and we're left with 576.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5760, and continue the process.

The final outcome is 8087.19284064, with a leftover of 5.76e-07.