We look at the division of 16691876 by 878 
The aim is to understand the frequency of 878 in 16691876.

Let's proceed to step 1:
If we divide 1 by 878, we get 0 and a remainder of 1.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 1 after subtracting 0 from 1.
Include the next digit (6) from the dividend after 1, then repeat: 16 / 878

Advancing to step 2:
878 can be fit into 16 0 times, resulting in a remainder of 16.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 16, we get 16.
Grab the next digit (6) from the dividend, add it to 16, then carry on: 166 / 878

On to step 3:
The number 878 fits into 166 0 times, leaving a remainder of 166.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 166 to get 166.
Grab the next digit (9) from the dividend, add it to 166, then carry on: 1669 / 878

Moving on to step 4:
878 goes into 1669 1 times with a remainder of 791.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
If we subtract 878 from 1669, we get 791.
Grab the next digit (1) from the dividend, add it to 791, then carry on: 7911 / 878

Let's proceed to step 5:
878 goes into 7911 9 times with a remainder of 9.
The number 9 becomes the next digit in our result. 
Result so far: 19.0
Subtract 7902 from 7911 to get 9.
Take the next digit (8) from the dividend and append it to 9, then repeat: 98 / 878

Moving on to step 6:
98 divided by 878 is 0 with a remainder of 98.
Put 0 as the next digit of the answer. 
Result so far: 190.0
If we subtract 0 from 98, we get 98.
Grab the next digit (7) from the dividend, add it to 98, then carry on: 987 / 878

Advancing to step 7:
987 divided by 878 is 1 with a remainder of 109.
Use 1 as the next digit of our solution. 
Result so far: 1901.0
Subtracting 878 from 987 leaves us with 109.
Take the next digit (6) from the dividend and append it to 109, then repeat: 1096 / 878

Let's proceed to step 8:
1096 divided by 878 is 1 with a remainder of 218.
Put 1 as the next digit of the answer. 
Result so far: 19011.0
Subtracting 878 from 1096 leaves us with 218.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2180, and continue the process.

Going ahead to step 9:
2180 divided by 878 is 2 with a remainder of 424.
Record the quotient 2 as the next digit in the result. 
Result so far: 19011.2
Deduct 1756 from 2180 and we're left with 424.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4240, and continue the process.

Going ahead to step 10:
878 goes into 4240 4 times with a remainder of 728.
The next digit of our result is 4. 
Result so far: 19011.24
Deduct 3512 from 4240 and we're left with 728.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7280, and continue the process.

Advancing to step 11:
If we divide 7280 by 878, we get 8 and a remainder of 256.
Record the quotient 8 as the next digit in the result. 
Result so far: 19011.248
If we subtract 7024 from 7280, we get 256.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2560, and continue the process.

Let's proceed to step 12:
If we divide 2560 by 878, we get 2 and a remainder of 804.
Put 2 as the next digit of the answer. 
Result so far: 19011.2482
Subtracting 1756 from 2560 leaves us with 804.
Since there are no more digits in the dividend, we add a zero to the remainder making it 8040, and continue the process.

Step 13:
When dividing 8040 by 878, we get 9 with a remainder of 138.
Write down 9 as next digit of the result. 
Result so far: 19011.24829
If we subtract 7902 from 8040, we get 138.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1380, and continue the process.

Going ahead to step 14:
If we divide 1380 by 878, we get 1 and a remainder of 502.
Write down 1 as next digit of the result. 
Result so far: 19011.248291
Subtracting 878 from 1380 leaves us with 502.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5020, and continue the process.

Let's proceed to step 15:
5020 divided by 878 is 5 with a remainder of 630.
The number 5 becomes the next digit in our result. 
Result so far: 19011.2482915
If we subtract 4390 from 5020, we get 630.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6300, and continue the process.

Let's proceed to step 16:
6300 divided by 878 is 7 with a remainder of 154.
Put 7 as the next digit of the answer. 
Result so far: 19011.24829157
The remainder is 154 after subtracting 6146 from 6300.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1540, and continue the process.

The final outcome is 19011.24829157, with a leftover of 1.54e-07.