76750873 ÷ 646 
The aim is to understand the frequency of 646 in 76750873.

Going ahead to step 1:
When dividing 7 by 646, we get 0 with a remainder of 7.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 7 to get 7.
Take the next digit (6) from the dividend and append it to 7, then repeat: 76 / 646

Going ahead to step 2:
If we divide 76 by 646, we get 0 and a remainder of 76.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 76 leaves us with 76.
Take the next digit (7) from the dividend and append it to 76, then repeat: 767 / 646

Going ahead to step 3:
646 can be fit into 767 1 times, resulting in a remainder of 121.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
Subtracting 646 from 767 leaves us with 121.
Append the next digit (5) from the dividend to 121 and continue with: 1215 / 646

Moving on to step 4:
The number 646 fits into 1215 1 times, leaving a remainder of 569.
Record the quotient 1 as the next digit in the result. 
Result so far: 11.0
Subtracting 646 from 1215 leaves us with 569.
Grab the next digit (0) from the dividend, add it to 569, then carry on: 5690 / 646

Let's proceed to step 5:
If we divide 5690 by 646, we get 8 and a remainder of 522.
Use 8 as the next digit of our solution. 
Result so far: 118.0
Subtracting 5168 from 5690 leaves us with 522.
Bring next digit (8) of the dividend behind the 522 and repeat the process: 5228 / 646

Step 6:
When dividing 5228 by 646, we get 8 with a remainder of 60.
Write down 8 as next digit of the result. 
Result so far: 1188.0
Subtracting 5168 from 5228 leaves us with 60.
Fetch the next digit (7) from the dividend, attach it to 60 and continue: 607 / 646

Step 7:
646 goes into 607 0 times with a remainder of 607.
Put 0 as the next digit of the answer. 
Result so far: 11880.0
Subtract 0 from 607 to get 607.
Include the next digit (3) from the dividend after 607, then repeat: 6073 / 646

Step 8:
646 goes into 6073 9 times with a remainder of 259.
Put 9 as the next digit of the answer. 
Result so far: 118809.0
Subtracting 5814 from 6073 leaves us with 259.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2590, and continue the process.

Moving on to step 9:
If we divide 2590 by 646, we get 4 and a remainder of 6.
Write down 4 as next digit of the result. 
Result so far: 118809.4
If we subtract 2584 from 2590, we get 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Moving on to step 10:
If we divide 60 by 646, we get 0 and a remainder of 60.
Record the quotient 0 as the next digit in the result. 
Result so far: 118809.4
If we subtract 0 from 60, we get 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

On to step 11:
646 can be fit into 600 0 times, resulting in a remainder of 600.
Put 0 as the next digit of the answer. 
Result so far: 118809.4
If we subtract 0 from 600, we get 600.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6000, and continue the process.

After the division, we end up with 118809.4 and a remainder of 0.06.