83812360 ÷ 991 
The aim is to understand the frequency of 991 in 83812360.

On to step 1:
When dividing 8 by 991, we get 0 with a remainder of 8.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 8 leaves us with 8.
Fetch the next digit (3) from the dividend, attach it to 8 and continue: 83 / 991

Let's proceed to step 2:
991 goes into 83 0 times with a remainder of 83.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 83 to get 83.
Append the next digit (8) from the dividend to 83 and continue with: 838 / 991

Step 3:
The number 991 fits into 838 0 times, leaving a remainder of 838.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 838 to get 838.
Fetch the next digit (1) from the dividend, attach it to 838 and continue: 8381 / 991

Moving on to step 4:
If we divide 8381 by 991, we get 8 and a remainder of 453.
Write down 8 as next digit of the result. 
Result so far: 8.0
If we subtract 7928 from 8381, we get 453.
Include the next digit (2) from the dividend after 453, then repeat: 4532 / 991

Advancing to step 5:
4532 divided by 991 is 4 with a remainder of 568.
Record the quotient 4 as the next digit in the result. 
Result so far: 84.0
Subtract 3964 from 4532 to get 568.
Fetch the next digit (3) from the dividend, attach it to 568 and continue: 5683 / 991

Advancing to step 6:
991 can be fit into 5683 5 times, resulting in a remainder of 728.
The number 5 becomes the next digit in our result. 
Result so far: 845.0
If we take 4955 away from 5683, we end up with 728.
Include the next digit (6) from the dividend after 728, then repeat: 7286 / 991

Let's proceed to step 7:
7286 divided by 991 is 7 with a remainder of 349.
The next digit of our result is 7. 
Result so far: 8457.0
The remainder is 349 after subtracting 6937 from 7286.
Append the next digit (0) from the dividend to 349 and continue with: 3490 / 991

Moving on to step 8:
991 goes into 3490 3 times with a remainder of 517.
Write down 3 as next digit of the result. 
Result so far: 84573.0
The remainder is 517 after subtracting 2973 from 3490.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5170, and continue the process.

Advancing to step 9:
991 can be fit into 5170 5 times, resulting in a remainder of 215.
Record the quotient 5 as the next digit in the result. 
Result so far: 84573.5
If we subtract 4955 from 5170, we get 215.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2150, and continue the process.

Step 10:
When dividing 2150 by 991, we get 2 with a remainder of 168.
The next digit of our result is 2. 
Result so far: 84573.52
Subtracting 1982 from 2150 leaves us with 168.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1680, and continue the process.

Going ahead to step 11:
1680 divided by 991 is 1 with a remainder of 689.
Put 1 as the next digit of the answer. 
Result so far: 84573.521
The remainder is 689 after subtracting 991 from 1680.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6890, and continue the process.

Let's proceed to step 12:
If we divide 6890 by 991, we get 6 and a remainder of 944.
Use 6 as the next digit of our solution. 
Result so far: 84573.5216
Subtracting 5946 from 6890 leaves us with 944.
Since there are no more digits in the dividend, we add a zero to the remainder making it 9440, and continue the process.

Moving on to step 13:
When dividing 9440 by 991, we get 9 with a remainder of 521.
Use 9 as the next digit of our solution. 
Result so far: 84573.52169
Subtracting 8919 from 9440 leaves us with 521.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5210, and continue the process.

Step 14:
The number 991 fits into 5210 5 times, leaving a remainder of 255.
Put 5 as the next digit of the answer. 
Result so far: 84573.521695
Subtracting 4955 from 5210 leaves us with 255.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2550, and continue the process.

Going ahead to step 15:
991 can be fit into 2550 2 times, resulting in a remainder of 568.
The number 2 becomes the next digit in our result. 
Result so far: 84573.5216952
Deduct 1982 from 2550 and we're left with 568.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5680, and continue the process.

Advancing to step 16:
If we divide 5680 by 991, we get 5 and a remainder of 725.
Use 5 as the next digit of our solution. 
Result so far: 84573.52169525
Deduct 4955 from 5680 and we're left with 725.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7250, and continue the process.

In conclusion, the division gives 84573.52169525 with a balance of 7.25e-07.