Let's divide 86203867 by 991
The aim is to understand the frequency of 991 in 86203867.

Going ahead to step 1:
The number 991 fits into 8 0 times, leaving a remainder of 8.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 8 and we're left with 8.
Take the next digit (6) from the dividend and append it to 8, then repeat: 86 / 991

Moving on to step 2:
86 divided by 991 is 0 with a remainder of 86.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 86 to get 86.
Take the next digit (2) from the dividend and append it to 86, then repeat: 862 / 991

Advancing to step 3:
991 goes into 862 0 times with a remainder of 862.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 862 to get 862.
Bring next digit (0) of the dividend behind the 862 and repeat the process: 8620 / 991

Let's proceed to step 4:
991 goes into 8620 8 times with a remainder of 692.
The next digit of our result is 8. 
Result so far: 8.0
If we take 7928 away from 8620, we end up with 692.
Append the next digit (3) from the dividend to 692 and continue with: 6923 / 991

Moving on to step 5:
991 can be fit into 6923 6 times, resulting in a remainder of 977.
The next digit of our result is 6. 
Result so far: 86.0
Subtract 5946 from 6923 to get 977.
Append the next digit (8) from the dividend to 977 and continue with: 9778 / 991

Moving on to step 6:
When dividing 9778 by 991, we get 9 with a remainder of 859.
Use 9 as the next digit of our solution. 
Result so far: 869.0
Subtract 8919 from 9778 to get 859.
Fetch the next digit (6) from the dividend, attach it to 859 and continue: 8596 / 991

Going ahead to step 7:
When dividing 8596 by 991, we get 8 with a remainder of 668.
Use 8 as the next digit of our solution. 
Result so far: 8698.0
If we take 7928 away from 8596, we end up with 668.
Bring next digit (7) of the dividend behind the 668 and repeat the process: 6687 / 991

Step 8:
The number 991 fits into 6687 6 times, leaving a remainder of 741.
Put 6 as the next digit of the answer. 
Result so far: 86986.0
If we subtract 5946 from 6687, we get 741.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7410, and continue the process.

Step 9:
If we divide 7410 by 991, we get 7 and a remainder of 473.
Put 7 as the next digit of the answer. 
Result so far: 86986.7
Subtract 6937 from 7410 to get 473.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4730, and continue the process.

On to step 10:
991 can be fit into 4730 4 times, resulting in a remainder of 766.
The number 4 becomes the next digit in our result. 
Result so far: 86986.74
If we subtract 3964 from 4730, we get 766.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7660, and continue the process.

Step 11:
991 goes into 7660 7 times with a remainder of 723.
The number 7 becomes the next digit in our result. 
Result so far: 86986.747
The remainder is 723 after subtracting 6937 from 7660.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7230, and continue the process.

Let's proceed to step 12:
991 goes into 7230 7 times with a remainder of 293.
The next digit of our result is 7. 
Result so far: 86986.7477
Subtracting 6937 from 7230 leaves us with 293.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2930, and continue the process.

The quotient of the division is 86986.7477, and the remainder is 0.00293.