We're dividing 68400923 by 126 
The aim is to understand the frequency of 126 in 68400923.

Advancing to step 1:
When dividing 6 by 126, we get 0 with a remainder of 6.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 6 and we're left with 6.
Include the next digit (8) from the dividend after 6, then repeat: 68 / 126

Going ahead to step 2:
When dividing 68 by 126, we get 0 with a remainder of 68.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 68, we get 68.
Take the next digit (4) from the dividend and append it to 68, then repeat: 684 / 126

Let's proceed to step 3:
126 can be fit into 684 5 times, resulting in a remainder of 54.
Put 5 as the next digit of the answer. 
Result so far: 5.0
The remainder is 54 after subtracting 630 from 684.
Take the next digit (0) from the dividend and append it to 54, then repeat: 540 / 126

Going ahead to step 4:
If we divide 540 by 126, we get 4 and a remainder of 36.
Write down 4 as next digit of the result. 
Result so far: 54.0
If we subtract 504 from 540, we get 36.
Fetch the next digit (0) from the dividend, attach it to 36 and continue: 360 / 126

Moving on to step 5:
If we divide 360 by 126, we get 2 and a remainder of 108.
Use 2 as the next digit of our solution. 
Result so far: 542.0
If we take 252 away from 360, we end up with 108.
Take the next digit (9) from the dividend and append it to 108, then repeat: 1089 / 126

Moving on to step 6:
126 can be fit into 1089 8 times, resulting in a remainder of 81.
The next digit of our result is 8. 
Result so far: 5428.0
Subtract 1008 from 1089 to get 81.
Fetch the next digit (2) from the dividend, attach it to 81 and continue: 812 / 126

On to step 7:
126 goes into 812 6 times with a remainder of 56.
Record the quotient 6 as the next digit in the result. 
Result so far: 54286.0
Subtracting 756 from 812 leaves us with 56.
Bring next digit (3) of the dividend behind the 56 and repeat the process: 563 / 126

On to step 8:
The number 126 fits into 563 4 times, leaving a remainder of 59.
Record the quotient 4 as the next digit in the result. 
Result so far: 542864.0
Deduct 504 from 563 and we're left with 59.
Since there are no more digits in the dividend, we add a zero to the remainder making it 590, and continue the process.

Advancing to step 9:
The number 126 fits into 590 4 times, leaving a remainder of 86.
The number 4 becomes the next digit in our result. 
Result so far: 542864.4
Subtracting 504 from 590 leaves us with 86.
Since there are no more digits in the dividend, we add a zero to the remainder making it 860, and continue the process.

Step 10:
126 can be fit into 860 6 times, resulting in a remainder of 104.
Write down 6 as next digit of the result. 
Result so far: 542864.46
Subtracting 756 from 860 leaves us with 104.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1040, and continue the process.

On to step 11:
When dividing 1040 by 126, we get 8 with a remainder of 32.
Put 8 as the next digit of the answer. 
Result so far: 542864.468
Subtract 1008 from 1040 to get 32.
Since there are no more digits in the dividend, we add a zero to the remainder making it 320, and continue the process.

Advancing to step 12:
320 divided by 126 is 2 with a remainder of 68.
Put 2 as the next digit of the answer. 
Result so far: 542864.4682
The remainder is 68 after subtracting 252 from 320.
Since there are no more digits in the dividend, we add a zero to the remainder making it 680, and continue the process.

Advancing to step 13:
When dividing 680 by 126, we get 5 with a remainder of 50.
Use 5 as the next digit of our solution. 
Result so far: 542864.46825
Deduct 630 from 680 and we're left with 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

Advancing to step 14:
If we divide 500 by 126, we get 3 and a remainder of 122.
Use 3 as the next digit of our solution. 
Result so far: 542864.468253
Subtract 378 from 500 to get 122.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1220, and continue the process.

Step 15:
126 goes into 1220 9 times with a remainder of 86.
Use 9 as the next digit of our solution. 
Result so far: 542864.4682539
Subtract 1134 from 1220 to get 86.
Since there are no more digits in the dividend, we add a zero to the remainder making it 860, and continue the process.

Advancing to step 16:
The number 126 fits into 860 6 times, leaving a remainder of 104.
Put 6 as the next digit of the answer. 
Result so far: 542864.46825396
If we subtract 756 from 860, we get 104.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1040, and continue the process.

The final outcome is 542864.46825396, with a leftover of 1.04e-07.