We look at the division of 645902 by 76 
The aim is to understand the frequency of 76 in 645902.

Step 1:
76 goes into 6 0 times with a remainder of 6.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 6, we get 6.
Include the next digit (4) from the dividend after 6, then repeat: 64 / 76

On to step 2:
76 goes into 64 0 times with a remainder of 64.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 64 and we're left with 64.
Include the next digit (5) from the dividend after 64, then repeat: 645 / 76

Let's proceed to step 3:
When dividing 645 by 76, we get 8 with a remainder of 37.
Put 8 as the next digit of the answer. 
Result so far: 8.0
Deduct 608 from 645 and we're left with 37.
Bring next digit (9) of the dividend behind the 37 and repeat the process: 379 / 76

Moving on to step 4:
76 can be fit into 379 4 times, resulting in a remainder of 75.
Write down 4 as next digit of the result. 
Result so far: 84.0
Deduct 304 from 379 and we're left with 75.
Grab the next digit (0) from the dividend, add it to 75, then carry on: 750 / 76

Advancing to step 5:
76 goes into 750 9 times with a remainder of 66.
Record the quotient 9 as the next digit in the result. 
Result so far: 849.0
Subtracting 684 from 750 leaves us with 66.
Include the next digit (2) from the dividend after 66, then repeat: 662 / 76

Going ahead to step 6:
76 goes into 662 8 times with a remainder of 54.
The next digit of our result is 8. 
Result so far: 8498.0
Subtracting 608 from 662 leaves us with 54.
Since there are no more digits in the dividend, we add a zero to the remainder making it 540, and continue the process.

Moving on to step 7:
540 divided by 76 is 7 with a remainder of 8.
Write down 7 as next digit of the result. 
Result so far: 8498.7
Subtract 532 from 540 to get 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Moving on to step 8:
76 goes into 80 1 times with a remainder of 4.
Record the quotient 1 as the next digit in the result. 
Result so far: 8498.71
Deduct 76 from 80 and we're left with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Advancing to step 9:
76 can be fit into 40 0 times, resulting in a remainder of 40.
Record the quotient 0 as the next digit in the result. 
Result so far: 8498.71
Deduct 0 from 40 and we're left with 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Let's proceed to step 10:
If we divide 400 by 76, we get 5 and a remainder of 20.
Put 5 as the next digit of the answer. 
Result so far: 8498.7105
If we subtract 380 from 400, we get 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Moving on to step 11:
76 can be fit into 200 2 times, resulting in a remainder of 48.
The next digit of our result is 2. 
Result so far: 8498.71052
If we subtract 152 from 200, we get 48.
Since there are no more digits in the dividend, we add a zero to the remainder making it 480, and continue the process.

On to step 12:
480 divided by 76 is 6 with a remainder of 24.
The number 6 becomes the next digit in our result. 
Result so far: 8498.710526
Subtract 456 from 480 to get 24.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

Advancing to step 13:
If we divide 240 by 76, we get 3 and a remainder of 12.
Use 3 as the next digit of our solution. 
Result so far: 8498.7105263
Subtract 228 from 240 to get 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Let's proceed to step 14:
76 goes into 120 1 times with a remainder of 44.
Put 1 as the next digit of the answer. 
Result so far: 8498.71052631
If we subtract 76 from 120, we get 44.
Since there are no more digits in the dividend, we add a zero to the remainder making it 440, and continue the process.

After the division, we end up with 8498.71052631 and a remainder of 4.4e-08.