We look at the division of 11357206 by 866 
The aim is to understand the frequency of 866 in 11357206.

Moving on to step 1:
The number 866 fits into 1 0 times, leaving a remainder of 1.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 1 and we're left with 1.
Fetch the next digit (1) from the dividend, attach it to 1 and continue: 11 / 866

Advancing to step 2:
866 goes into 11 0 times with a remainder of 11.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 11 and we're left with 11.
Grab the next digit (3) from the dividend, add it to 11, then carry on: 113 / 866

Going ahead to step 3:
113 divided by 866 is 0 with a remainder of 113.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 113 after subtracting 0 from 113.
Grab the next digit (5) from the dividend, add it to 113, then carry on: 1135 / 866

Going ahead to step 4:
866 goes into 1135 1 times with a remainder of 269.
Put 1 as the next digit of the answer. 
Result so far: 1.0
Deduct 866 from 1135 and we're left with 269.
Include the next digit (7) from the dividend after 269, then repeat: 2697 / 866

Going ahead to step 5:
If we divide 2697 by 866, we get 3 and a remainder of 99.
Write down 3 as next digit of the result. 
Result so far: 13.0
The remainder is 99 after subtracting 2598 from 2697.
Fetch the next digit (2) from the dividend, attach it to 99 and continue: 992 / 866

Moving on to step 6:
The number 866 fits into 992 1 times, leaving a remainder of 126.
Put 1 as the next digit of the answer. 
Result so far: 131.0
If we subtract 866 from 992, we get 126.
Bring next digit (0) of the dividend behind the 126 and repeat the process: 1260 / 866

Step 7:
866 can be fit into 1260 1 times, resulting in a remainder of 394.
The next digit of our result is 1. 
Result so far: 1311.0
Subtract 866 from 1260 to get 394.
Bring next digit (6) of the dividend behind the 394 and repeat the process: 3946 / 866

Going ahead to step 8:
If we divide 3946 by 866, we get 4 and a remainder of 482.
The number 4 becomes the next digit in our result. 
Result so far: 13114.0
The remainder is 482 after subtracting 3464 from 3946.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4820, and continue the process.

Moving on to step 9:
If we divide 4820 by 866, we get 5 and a remainder of 490.
Write down 5 as next digit of the result. 
Result so far: 13114.5
The remainder is 490 after subtracting 4330 from 4820.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4900, and continue the process.

Advancing to step 10:
When dividing 4900 by 866, we get 5 with a remainder of 570.
Record the quotient 5 as the next digit in the result. 
Result so far: 13114.55
Deduct 4330 from 4900 and we're left with 570.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5700, and continue the process.

The quotient of the division is 13114.55, and the remainder is 0.57.