21099727 divided by 124 
The aim is to understand the frequency of 124 in 21099727.

On to step 1:
2 divided by 124 is 0 with a remainder of 2.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 2 after subtracting 0 from 2.
Append the next digit (1) from the dividend to 2 and continue with: 21 / 124

Advancing to step 2:
If we divide 21 by 124, we get 0 and a remainder of 21.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 21, we get 21.
Grab the next digit (0) from the dividend, add it to 21, then carry on: 210 / 124

Let's proceed to step 3:
124 goes into 210 1 times with a remainder of 86.
Write down 1 as next digit of the result. 
Result so far: 1.0
If we subtract 124 from 210, we get 86.
Grab the next digit (9) from the dividend, add it to 86, then carry on: 869 / 124

On to step 4:
124 goes into 869 7 times with a remainder of 1.
The number 7 becomes the next digit in our result. 
Result so far: 17.0
Subtract 868 from 869 to get 1.
Take the next digit (9) from the dividend and append it to 1, then repeat: 19 / 124

Advancing to step 5:
19 divided by 124 is 0 with a remainder of 19.
The number 0 becomes the next digit in our result. 
Result so far: 170.0
If we take 0 away from 19, we end up with 19.
Include the next digit (7) from the dividend after 19, then repeat: 197 / 124

Let's proceed to step 6:
124 can be fit into 197 1 times, resulting in a remainder of 73.
The next digit of our result is 1. 
Result so far: 1701.0
Subtracting 124 from 197 leaves us with 73.
Bring next digit (2) of the dividend behind the 73 and repeat the process: 732 / 124

Advancing to step 7:
732 divided by 124 is 5 with a remainder of 112.
The number 5 becomes the next digit in our result. 
Result so far: 17015.0
The remainder is 112 after subtracting 620 from 732.
Grab the next digit (7) from the dividend, add it to 112, then carry on: 1127 / 124

Advancing to step 8:
If we divide 1127 by 124, we get 9 and a remainder of 11.
The next digit of our result is 9. 
Result so far: 170159.0
Subtracting 1116 from 1127 leaves us with 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Let's proceed to step 9:
110 divided by 124 is 0 with a remainder of 110.
Write down 0 as next digit of the result. 
Result so far: 170159.0
If we subtract 0 from 110, we get 110.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1100, and continue the process.

On to step 10:
The number 124 fits into 1100 8 times, leaving a remainder of 108.
The number 8 becomes the next digit in our result. 
Result so far: 170159.08
The remainder is 108 after subtracting 992 from 1100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1080, and continue the process.

On to step 11:
If we divide 1080 by 124, we get 8 and a remainder of 88.
The number 8 becomes the next digit in our result. 
Result so far: 170159.088
Subtracting 992 from 1080 leaves us with 88.
Since there are no more digits in the dividend, we add a zero to the remainder making it 880, and continue the process.

The final outcome is 170159.088, with a leftover of 0.0088.