We're dividing 99987943 by 879 
The aim is to understand the frequency of 879 in 99987943.

Step 1:
The number 879 fits into 9 0 times, leaving a remainder of 9.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 9 and we're left with 9.
Append the next digit (9) from the dividend to 9 and continue with: 99 / 879

Advancing to step 2:
The number 879 fits into 99 0 times, leaving a remainder of 99.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 99 to get 99.
Take the next digit (9) from the dividend and append it to 99, then repeat: 999 / 879

Going ahead to step 3:
When dividing 999 by 879, we get 1 with a remainder of 120.
Put 1 as the next digit of the answer. 
Result so far: 1.0
The remainder is 120 after subtracting 879 from 999.
Include the next digit (8) from the dividend after 120, then repeat: 1208 / 879

Let's proceed to step 4:
879 goes into 1208 1 times with a remainder of 329.
Put 1 as the next digit of the answer. 
Result so far: 11.0
If we subtract 879 from 1208, we get 329.
Fetch the next digit (7) from the dividend, attach it to 329 and continue: 3297 / 879

Step 5:
If we divide 3297 by 879, we get 3 and a remainder of 660.
The next digit of our result is 3. 
Result so far: 113.0
The remainder is 660 after subtracting 2637 from 3297.
Take the next digit (9) from the dividend and append it to 660, then repeat: 6609 / 879

Advancing to step 6:
When dividing 6609 by 879, we get 7 with a remainder of 456.
The next digit of our result is 7. 
Result so far: 1137.0
Subtracting 6153 from 6609 leaves us with 456.
Append the next digit (4) from the dividend to 456 and continue with: 4564 / 879

Let's proceed to step 7:
879 goes into 4564 5 times with a remainder of 169.
Use 5 as the next digit of our solution. 
Result so far: 11375.0
The remainder is 169 after subtracting 4395 from 4564.
Take the next digit (3) from the dividend and append it to 169, then repeat: 1693 / 879

Moving on to step 8:
879 goes into 1693 1 times with a remainder of 814.
Write down 1 as next digit of the result. 
Result so far: 113751.0
The remainder is 814 after subtracting 879 from 1693.
Since there are no more digits in the dividend, we add a zero to the remainder making it 8140, and continue the process.

Let's proceed to step 9:
If we divide 8140 by 879, we get 9 and a remainder of 229.
Record the quotient 9 as the next digit in the result. 
Result so far: 113751.9
The remainder is 229 after subtracting 7911 from 8140.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2290, and continue the process.

Let's proceed to step 10:
When dividing 2290 by 879, we get 2 with a remainder of 532.
The next digit of our result is 2. 
Result so far: 113751.92
Subtracting 1758 from 2290 leaves us with 532.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5320, and continue the process.

Advancing to step 11:
5320 divided by 879 is 6 with a remainder of 46.
Write down 6 as next digit of the result. 
Result so far: 113751.926
If we subtract 5274 from 5320, we get 46.
Since there are no more digits in the dividend, we add a zero to the remainder making it 460, and continue the process.

Let's proceed to step 12:
460 divided by 879 is 0 with a remainder of 460.
Write down 0 as next digit of the result. 
Result so far: 113751.926
The remainder is 460 after subtracting 0 from 460.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4600, and continue the process.

Going ahead to step 13:
When dividing 4600 by 879, we get 5 with a remainder of 205.
Record the quotient 5 as the next digit in the result. 
Result so far: 113751.92605
Subtract 4395 from 4600 to get 205.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2050, and continue the process.

Going ahead to step 14:
When dividing 2050 by 879, we get 2 with a remainder of 292.
Record the quotient 2 as the next digit in the result. 
Result so far: 113751.926052
Subtract 1758 from 2050 to get 292.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2920, and continue the process.

Let's proceed to step 15:
The number 879 fits into 2920 3 times, leaving a remainder of 283.
The number 3 becomes the next digit in our result. 
Result so far: 113751.9260523
If we take 2637 away from 2920, we end up with 283.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2830, and continue the process.

Moving on to step 16:
When dividing 2830 by 879, we get 3 with a remainder of 193.
The next digit of our result is 3. 
Result so far: 113751.92605233
Subtracting 2637 from 2830 leaves us with 193.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1930, and continue the process.

In conclusion, the division gives 113751.92605233 with a balance of 1.93e-07.