We look at the division of 106639 by 663 
The aim is to understand the frequency of 663 in 106639.

On to step 1:
1 divided by 663 is 0 with a remainder of 1.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 1, we get 1.
Grab the next digit (0) from the dividend, add it to 1, then carry on: 10 / 663

Moving on to step 2:
10 divided by 663 is 0 with a remainder of 10.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 10 to get 10.
Include the next digit (6) from the dividend after 10, then repeat: 106 / 663

Advancing to step 3:
663 can be fit into 106 0 times, resulting in a remainder of 106.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 106, we get 106.
Take the next digit (6) from the dividend and append it to 106, then repeat: 1066 / 663

Moving on to step 4:
663 goes into 1066 1 times with a remainder of 403.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
Deduct 663 from 1066 and we're left with 403.
Include the next digit (3) from the dividend after 403, then repeat: 4033 / 663

Step 5:
4033 divided by 663 is 6 with a remainder of 55.
Write down 6 as next digit of the result. 
Result so far: 16.0
The remainder is 55 after subtracting 3978 from 4033.
Include the next digit (9) from the dividend after 55, then repeat: 559 / 663

Step 6:
663 can be fit into 559 0 times, resulting in a remainder of 559.
Write down 0 as next digit of the result. 
Result so far: 160.0
Deduct 0 from 559 and we're left with 559.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5590, and continue the process.

Advancing to step 7:
The number 663 fits into 5590 8 times, leaving a remainder of 286.
The next digit of our result is 8. 
Result so far: 160.8
Subtracting 5304 from 5590 leaves us with 286.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2860, and continue the process.

Step 8:
663 goes into 2860 4 times with a remainder of 208.
Put 4 as the next digit of the answer. 
Result so far: 160.84
Subtract 2652 from 2860 to get 208.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2080, and continue the process.

Moving on to step 9:
When dividing 2080 by 663, we get 3 with a remainder of 91.
The number 3 becomes the next digit in our result. 
Result so far: 160.843
If we take 1989 away from 2080, we end up with 91.
Since there are no more digits in the dividend, we add a zero to the remainder making it 910, and continue the process.

On to step 10:
The number 663 fits into 910 1 times, leaving a remainder of 247.
Use 1 as the next digit of our solution. 
Result so far: 160.8431
If we subtract 663 from 910, we get 247.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2470, and continue the process.

Advancing to step 11:
663 goes into 2470 3 times with a remainder of 481.
Put 3 as the next digit of the answer. 
Result so far: 160.84313
If we subtract 1989 from 2470, we get 481.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4810, and continue the process.

Step 12:
If we divide 4810 by 663, we get 7 and a remainder of 169.
The number 7 becomes the next digit in our result. 
Result so far: 160.843137
Deduct 4641 from 4810 and we're left with 169.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1690, and continue the process.

On to step 13:
The number 663 fits into 1690 2 times, leaving a remainder of 364.
Write down 2 as next digit of the result. 
Result so far: 160.8431372
Subtracting 1326 from 1690 leaves us with 364.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3640, and continue the process.

Moving on to step 14:
If we divide 3640 by 663, we get 5 and a remainder of 325.
The next digit of our result is 5. 
Result so far: 160.84313725
If we subtract 3315 from 3640, we get 325.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3250, and continue the process.

In conclusion, the division gives 160.84313725 with a balance of 3.25e-07.