We look at the division of 63405749 by 123 
The aim is to understand the frequency of 123 in 63405749.

Going ahead to step 1:
If we divide 6 by 123, we get 0 and a remainder of 6.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 6 to get 6.
Grab the next digit (3) from the dividend, add it to 6, then carry on: 63 / 123

Going ahead to step 2:
The number 123 fits into 63 0 times, leaving a remainder of 63.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 63 leaves us with 63.
Fetch the next digit (4) from the dividend, attach it to 63 and continue: 634 / 123

Let's proceed to step 3:
123 goes into 634 5 times with a remainder of 19.
The number 5 becomes the next digit in our result. 
Result so far: 5.0
If we subtract 615 from 634, we get 19.
Fetch the next digit (0) from the dividend, attach it to 19 and continue: 190 / 123

Advancing to step 4:
If we divide 190 by 123, we get 1 and a remainder of 67.
The next digit of our result is 1. 
Result so far: 51.0
If we take 123 away from 190, we end up with 67.
Take the next digit (5) from the dividend and append it to 67, then repeat: 675 / 123

Step 5:
675 divided by 123 is 5 with a remainder of 60.
Use 5 as the next digit of our solution. 
Result so far: 515.0
Subtracting 615 from 675 leaves us with 60.
Bring next digit (7) of the dividend behind the 60 and repeat the process: 607 / 123

Let's proceed to step 6:
123 can be fit into 607 4 times, resulting in a remainder of 115.
Write down 4 as next digit of the result. 
Result so far: 5154.0
The remainder is 115 after subtracting 492 from 607.
Grab the next digit (4) from the dividend, add it to 115, then carry on: 1154 / 123

On to step 7:
The number 123 fits into 1154 9 times, leaving a remainder of 47.
Record the quotient 9 as the next digit in the result. 
Result so far: 51549.0
If we subtract 1107 from 1154, we get 47.
Bring next digit (9) of the dividend behind the 47 and repeat the process: 479 / 123

Let's proceed to step 8:
123 goes into 479 3 times with a remainder of 110.
Record the quotient 3 as the next digit in the result. 
Result so far: 515493.0
Subtracting 369 from 479 leaves us with 110.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1100, and continue the process.

Advancing to step 9:
When dividing 1100 by 123, we get 8 with a remainder of 116.
Put 8 as the next digit of the answer. 
Result so far: 515493.8
If we subtract 984 from 1100, we get 116.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1160, and continue the process.

Moving on to step 10:
123 goes into 1160 9 times with a remainder of 53.
Use 9 as the next digit of our solution. 
Result so far: 515493.89
Deduct 1107 from 1160 and we're left with 53.
Since there are no more digits in the dividend, we add a zero to the remainder making it 530, and continue the process.

Advancing to step 11:
530 divided by 123 is 4 with a remainder of 38.
Record the quotient 4 as the next digit in the result. 
Result so far: 515493.894
Deduct 492 from 530 and we're left with 38.
Since there are no more digits in the dividend, we add a zero to the remainder making it 380, and continue the process.

Step 12:
380 divided by 123 is 3 with a remainder of 11.
Write down 3 as next digit of the result. 
Result so far: 515493.8943
The remainder is 11 after subtracting 369 from 380.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Going ahead to step 13:
When dividing 110 by 123, we get 0 with a remainder of 110.
The next digit of our result is 0. 
Result so far: 515493.8943
The remainder is 110 after subtracting 0 from 110.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1100, and continue the process.

Moving on to step 14:
123 goes into 1100 8 times with a remainder of 116.
The next digit of our result is 8. 
Result so far: 515493.894308
Subtract 984 from 1100 to get 116.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1160, and continue the process.

Advancing to step 15:
When dividing 1160 by 123, we get 9 with a remainder of 53.
Put 9 as the next digit of the answer. 
Result so far: 515493.8943089
Deduct 1107 from 1160 and we're left with 53.
Since there are no more digits in the dividend, we add a zero to the remainder making it 530, and continue the process.

Advancing to step 16:
The number 123 fits into 530 4 times, leaving a remainder of 38.
Write down 4 as next digit of the result. 
Result so far: 515493.89430894
Subtract 492 from 530 to get 38.
Since there are no more digits in the dividend, we add a zero to the remainder making it 380, and continue the process.

The final outcome is 515493.89430894, with a leftover of 3.8e-08.