We look at the division of 63306861 by 879 
The aim is to understand the frequency of 879 in 63306861.

On to step 1:
879 goes into 6 0 times with a remainder of 6.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 6 leaves us with 6.
Fetch the next digit (3) from the dividend, attach it to 6 and continue: 63 / 879

Advancing to step 2:
If we divide 63 by 879, we get 0 and a remainder of 63.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 63, we get 63.
Take the next digit (3) from the dividend and append it to 63, then repeat: 633 / 879

Going ahead to step 3:
633 divided by 879 is 0 with a remainder of 633.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 633 to get 633.
Bring next digit (0) of the dividend behind the 633 and repeat the process: 6330 / 879

On to step 4:
If we divide 6330 by 879, we get 7 and a remainder of 177.
Use 7 as the next digit of our solution. 
Result so far: 7.0
If we take 6153 away from 6330, we end up with 177.
Append the next digit (6) from the dividend to 177 and continue with: 1776 / 879

Advancing to step 5:
879 goes into 1776 2 times with a remainder of 18.
Write down 2 as next digit of the result. 
Result so far: 72.0
Deduct 1758 from 1776 and we're left with 18.
Take the next digit (8) from the dividend and append it to 18, then repeat: 188 / 879

Let's proceed to step 6:
879 goes into 188 0 times with a remainder of 188.
The next digit of our result is 0. 
Result so far: 720.0
Subtracting 0 from 188 leaves us with 188.
Take the next digit (6) from the dividend and append it to 188, then repeat: 1886 / 879

Going ahead to step 7:
If we divide 1886 by 879, we get 2 and a remainder of 128.
Write down 2 as next digit of the result. 
Result so far: 7202.0
The remainder is 128 after subtracting 1758 from 1886.
Append the next digit (1) from the dividend to 128 and continue with: 1281 / 879

Let's proceed to step 8:
The number 879 fits into 1281 1 times, leaving a remainder of 402.
Put 1 as the next digit of the answer. 
Result so far: 72021.0
If we take 879 away from 1281, we end up with 402.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4020, and continue the process.

Step 9:
When dividing 4020 by 879, we get 4 with a remainder of 504.
Record the quotient 4 as the next digit in the result. 
Result so far: 72021.4
If we take 3516 away from 4020, we end up with 504.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5040, and continue the process.

Step 10:
If we divide 5040 by 879, we get 5 and a remainder of 645.
Record the quotient 5 as the next digit in the result. 
Result so far: 72021.45
If we subtract 4395 from 5040, we get 645.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6450, and continue the process.

On to step 11:
6450 divided by 879 is 7 with a remainder of 297.
Put 7 as the next digit of the answer. 
Result so far: 72021.457
If we subtract 6153 from 6450, we get 297.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2970, and continue the process.

Moving on to step 12:
The number 879 fits into 2970 3 times, leaving a remainder of 333.
Record the quotient 3 as the next digit in the result. 
Result so far: 72021.4573
Deduct 2637 from 2970 and we're left with 333.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3330, and continue the process.

Step 13:
3330 divided by 879 is 3 with a remainder of 693.
Record the quotient 3 as the next digit in the result. 
Result so far: 72021.45733
Subtract 2637 from 3330 to get 693.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6930, and continue the process.

The final result is 72021.45733 with a remainder of 0.000693.