We look at the division of 16959877 by 123 
The aim is to understand the frequency of 123 in 16959877.

Advancing to step 1:
The number 123 fits into 1 0 times, leaving a remainder of 1.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 1 to get 1.
Bring next digit (6) of the dividend behind the 1 and repeat the process: 16 / 123

Moving on to step 2:
123 goes into 16 0 times with a remainder of 16.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 16, we get 16.
Take the next digit (9) from the dividend and append it to 16, then repeat: 169 / 123

Advancing to step 3:
The number 123 fits into 169 1 times, leaving a remainder of 46.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
The remainder is 46 after subtracting 123 from 169.
Bring next digit (5) of the dividend behind the 46 and repeat the process: 465 / 123

Advancing to step 4:
465 divided by 123 is 3 with a remainder of 96.
Put 3 as the next digit of the answer. 
Result so far: 13.0
Subtracting 369 from 465 leaves us with 96.
Append the next digit (9) from the dividend to 96 and continue with: 969 / 123

Going ahead to step 5:
The number 123 fits into 969 7 times, leaving a remainder of 108.
The next digit of our result is 7. 
Result so far: 137.0
Subtracting 861 from 969 leaves us with 108.
Include the next digit (8) from the dividend after 108, then repeat: 1088 / 123

On to step 6:
When dividing 1088 by 123, we get 8 with a remainder of 104.
Put 8 as the next digit of the answer. 
Result so far: 1378.0
Deduct 984 from 1088 and we're left with 104.
Include the next digit (7) from the dividend after 104, then repeat: 1047 / 123

On to step 7:
123 can be fit into 1047 8 times, resulting in a remainder of 63.
Write down 8 as next digit of the result. 
Result so far: 13788.0
Subtract 984 from 1047 to get 63.
Take the next digit (7) from the dividend and append it to 63, then repeat: 637 / 123

Moving on to step 8:
When dividing 637 by 123, we get 5 with a remainder of 22.
Use 5 as the next digit of our solution. 
Result so far: 137885.0
Subtract 615 from 637 to get 22.
Since there are no more digits in the dividend, we add a zero to the remainder making it 220, and continue the process.

Going ahead to step 9:
When dividing 220 by 123, we get 1 with a remainder of 97.
Use 1 as the next digit of our solution. 
Result so far: 137885.1
Subtracting 123 from 220 leaves us with 97.
Since there are no more digits in the dividend, we add a zero to the remainder making it 970, and continue the process.

Going ahead to step 10:
123 goes into 970 7 times with a remainder of 109.
Put 7 as the next digit of the answer. 
Result so far: 137885.17
Subtracting 861 from 970 leaves us with 109.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1090, and continue the process.

Step 11:
123 can be fit into 1090 8 times, resulting in a remainder of 106.
Use 8 as the next digit of our solution. 
Result so far: 137885.178
If we take 984 away from 1090, we end up with 106.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1060, and continue the process.

Moving on to step 12:
The number 123 fits into 1060 8 times, leaving a remainder of 76.
Put 8 as the next digit of the answer. 
Result so far: 137885.1788
The remainder is 76 after subtracting 984 from 1060.
Since there are no more digits in the dividend, we add a zero to the remainder making it 760, and continue the process.

After the division, we end up with 137885.1788 and a remainder of 0.00076.