We look at the division of 648210 by 77 
The aim is to understand the frequency of 77 in 648210.

Step 1:
If we divide 6 by 77, we get 0 and 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.
Fetch the next digit (4) from the dividend, attach it to 6 and continue: 64 / 77

Moving on to step 2:
The number 77 fits into 64 0 times, leaving a remainder of 64.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 64, we end up with 64.
Bring next digit (8) of the dividend behind the 64 and repeat the process: 648 / 77

Step 3:
648 divided by 77 is 8 with a remainder of 32.
Record the quotient 8 as the next digit in the result. 
Result so far: 8.0
If we subtract 616 from 648, we get 32.
Grab the next digit (2) from the dividend, add it to 32, then carry on: 322 / 77

Step 4:
322 divided by 77 is 4 with a remainder of 14.
Put 4 as the next digit of the answer. 
Result so far: 84.0
Subtracting 308 from 322 leaves us with 14.
Bring next digit (1) of the dividend behind the 14 and repeat the process: 141 / 77

Going ahead to step 5:
When dividing 141 by 77, we get 1 with a remainder of 64.
The next digit of our result is 1. 
Result so far: 841.0
If we subtract 77 from 141, we get 64.
Include the next digit (0) from the dividend after 64, then repeat: 640 / 77

Moving on to step 6:
640 divided by 77 is 8 with a remainder of 24.
Use 8 as the next digit of our solution. 
Result so far: 8418.0
If we take 616 away from 640, we end up with 24.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

Going ahead to step 7:
When dividing 240 by 77, we get 3 with a remainder of 9.
The next digit of our result is 3. 
Result so far: 8418.3
If we subtract 231 from 240, we get 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Step 8:
When dividing 90 by 77, we get 1 with a remainder of 13.
Put 1 as the next digit of the answer. 
Result so far: 8418.31
If we subtract 77 from 90, we get 13.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

Advancing to step 9:
77 goes into 130 1 times with a remainder of 53.
The next digit of our result is 1. 
Result so far: 8418.311
If we subtract 77 from 130, we get 53.
Since there are no more digits in the dividend, we add a zero to the remainder making it 530, and continue the process.

In conclusion, the division gives 8418.311 with a balance of 0.0053.