69415101 ÷ 866 
The aim is to understand the frequency of 866 in 69415101.

Going ahead to step 1:
866 can be fit into 6 0 times, resulting in a remainder of 6.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 6, we end up with 6.
Include the next digit (9) from the dividend after 6, then repeat: 69 / 866

On to step 2:
When dividing 69 by 866, we get 0 with a remainder of 69.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 69 after subtracting 0 from 69.
Grab the next digit (4) from the dividend, add it to 69, then carry on: 694 / 866

Step 3:
866 can be fit into 694 0 times, resulting in a remainder of 694.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 694, we get 694.
Append the next digit (1) from the dividend to 694 and continue with: 6941 / 866

Going ahead to step 4:
866 can be fit into 6941 8 times, resulting in a remainder of 13.
Record the quotient 8 as the next digit in the result. 
Result so far: 8.0
If we subtract 6928 from 6941, we get 13.
Fetch the next digit (5) from the dividend, attach it to 13 and continue: 135 / 866

Advancing to step 5:
When dividing 135 by 866, we get 0 with a remainder of 135.
Write down 0 as next digit of the result. 
Result so far: 80.0
Deduct 0 from 135 and we're left with 135.
Grab the next digit (1) from the dividend, add it to 135, then carry on: 1351 / 866

Going ahead to step 6:
The number 866 fits into 1351 1 times, leaving a remainder of 485.
The next digit of our result is 1. 
Result so far: 801.0
Deduct 866 from 1351 and we're left with 485.
Fetch the next digit (0) from the dividend, attach it to 485 and continue: 4850 / 866

Moving on to step 7:
4850 divided by 866 is 5 with a remainder of 520.
Record the quotient 5 as the next digit in the result. 
Result so far: 8015.0
Deduct 4330 from 4850 and we're left with 520.
Include the next digit (1) from the dividend after 520, then repeat: 5201 / 866

Advancing to step 8:
866 can be fit into 5201 6 times, resulting in a remainder of 5.
Put 6 as the next digit of the answer. 
Result so far: 80156.0
Deduct 5196 from 5201 and we're left with 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Advancing to step 9:
If we divide 50 by 866, we get 0 and a remainder of 50.
The next digit of our result is 0. 
Result so far: 80156.0
The remainder is 50 after subtracting 0 from 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

Moving on to step 10:
866 goes into 500 0 times with a remainder of 500.
The next digit of our result is 0. 
Result so far: 80156.0
Subtract 0 from 500 to get 500.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5000, and continue the process.

After the division, we end up with 80156.0 and a remainder of 0.5.