We look at the division of 3679877 by 876 
The aim is to understand the frequency of 876 in 3679877.

Advancing to step 1:
If we divide 3 by 876, we get 0 and a remainder of 3.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 3 to get 3.
Include the next digit (6) from the dividend after 3, then repeat: 36 / 876

Moving on to step 2:
The number 876 fits into 36 0 times, leaving a remainder of 36.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 36 and we're left with 36.
Fetch the next digit (7) from the dividend, attach it to 36 and continue: 367 / 876

Let's proceed to step 3:
The number 876 fits into 367 0 times, leaving a remainder of 367.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 367 and we're left with 367.
Grab the next digit (9) from the dividend, add it to 367, then carry on: 3679 / 876

On to step 4:
When dividing 3679 by 876, we get 4 with a remainder of 175.
Record the quotient 4 as the next digit in the result. 
Result so far: 4.0
Subtracting 3504 from 3679 leaves us with 175.
Take the next digit (8) from the dividend and append it to 175, then repeat: 1758 / 876

Advancing to step 5:
When dividing 1758 by 876, we get 2 with a remainder of 6.
Use 2 as the next digit of our solution. 
Result so far: 42.0
Subtracting 1752 from 1758 leaves us with 6.
Include the next digit (7) from the dividend after 6, then repeat: 67 / 876

On to step 6:
876 can be fit into 67 0 times, resulting in a remainder of 67.
The number 0 becomes the next digit in our result. 
Result so far: 420.0
If we take 0 away from 67, we end up with 67.
Bring next digit (7) of the dividend behind the 67 and repeat the process: 677 / 876

On to step 7:
876 goes into 677 0 times with a remainder of 677.
Write down 0 as next digit of the result. 
Result so far: 4200.0
If we take 0 away from 677, we end up with 677.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6770, and continue the process.

Advancing to step 8:
6770 divided by 876 is 7 with a remainder of 638.
Put 7 as the next digit of the answer. 
Result so far: 4200.7
Subtract 6132 from 6770 to get 638.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6380, and continue the process.

Step 9:
876 can be fit into 6380 7 times, resulting in a remainder of 248.
Record the quotient 7 as the next digit in the result. 
Result so far: 4200.77
If we subtract 6132 from 6380, we get 248.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2480, and continue the process.

The final result is 4200.77 with a remainder of 0.248.