We're dividing 77208839 by 870 
The aim is to understand the frequency of 870 in 77208839.

Advancing to step 1:
7 divided by 870 is 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 (7) from the dividend and append it to 7, then repeat: 77 / 870

Going ahead to step 2:
When dividing 77 by 870, we get 0 with a remainder of 77.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 77, we get 77.
Fetch the next digit (2) from the dividend, attach it to 77 and continue: 772 / 870

Moving on to step 3:
870 goes into 772 0 times with a remainder of 772.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 772 after subtracting 0 from 772.
Grab the next digit (0) from the dividend, add it to 772, then carry on: 7720 / 870

Let's proceed to step 4:
If we divide 7720 by 870, we get 8 and a remainder of 760.
Record the quotient 8 as the next digit in the result. 
Result so far: 8.0
If we subtract 6960 from 7720, we get 760.
Include the next digit (8) from the dividend after 760, then repeat: 7608 / 870

Advancing to step 5:
When dividing 7608 by 870, we get 8 with a remainder of 648.
Use 8 as the next digit of our solution. 
Result so far: 88.0
Subtract 6960 from 7608 to get 648.
Bring next digit (8) of the dividend behind the 648 and repeat the process: 6488 / 870

Let's proceed to step 6:
If we divide 6488 by 870, we get 7 and a remainder of 398.
Put 7 as the next digit of the answer. 
Result so far: 887.0
Subtract 6090 from 6488 to get 398.
Take the next digit (3) from the dividend and append it to 398, then repeat: 3983 / 870

Advancing to step 7:
870 goes into 3983 4 times with a remainder of 503.
The next digit of our result is 4. 
Result so far: 8874.0
If we take 3480 away from 3983, we end up with 503.
Bring next digit (9) of the dividend behind the 503 and repeat the process: 5039 / 870

Let's proceed to step 8:
If we divide 5039 by 870, we get 5 and a remainder of 689.
Use 5 as the next digit of our solution. 
Result so far: 88745.0
The remainder is 689 after subtracting 4350 from 5039.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6890, and continue the process.

Moving on to step 9:
870 can be fit into 6890 7 times, resulting in a remainder of 800.
Use 7 as the next digit of our solution. 
Result so far: 88745.7
Subtract 6090 from 6890 to get 800.
Since there are no more digits in the dividend, we add a zero to the remainder making it 8000, and continue the process.

Advancing to step 10:
870 can be fit into 8000 9 times, resulting in a remainder of 170.
Record the quotient 9 as the next digit in the result. 
Result so far: 88745.79
If we subtract 7830 from 8000, we get 170.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1700, and continue the process.

Moving on to step 11:
When dividing 1700 by 870, we get 1 with a remainder of 830.
Use 1 as the next digit of our solution. 
Result so far: 88745.791
Subtracting 870 from 1700 leaves us with 830.
Since there are no more digits in the dividend, we add a zero to the remainder making it 8300, and continue the process.

Advancing to step 12:
870 can be fit into 8300 9 times, resulting in a remainder of 470.
Put 9 as the next digit of the answer. 
Result so far: 88745.7919
The remainder is 470 after subtracting 7830 from 8300.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4700, and continue the process.

Going ahead to step 13:
4700 divided by 870 is 5 with a remainder of 350.
Write down 5 as next digit of the result. 
Result so far: 88745.79195
Subtract 4350 from 4700 to get 350.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3500, and continue the process.

Advancing to step 14:
If we divide 3500 by 870, we get 4 and a remainder of 20.
The number 4 becomes the next digit in our result. 
Result so far: 88745.791954
Subtract 3480 from 3500 to get 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Going ahead to step 15:
The number 870 fits into 200 0 times, leaving a remainder of 200.
Write down 0 as next digit of the result. 
Result so far: 88745.791954
Deduct 0 from 200 and we're left with 200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2000, and continue the process.

Moving on to step 16:
The number 870 fits into 2000 2 times, leaving a remainder of 260.
Use 2 as the next digit of our solution. 
Result so far: 88745.79195402
If we take 1740 away from 2000, we end up with 260.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2600, and continue the process.

The final result is 88745.79195402 with a remainder of 2.6e-07.