We look at the division of 7134905 by 991 
The aim is to understand the frequency of 991 in 7134905.

On to step 1:
When dividing 7 by 991, we get 0 with a remainder of 7.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 7, we get 7.
Bring next digit (1) of the dividend behind the 7 and repeat the process: 71 / 991

Advancing to step 2:
If we divide 71 by 991, we get 0 and a remainder of 71.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 71 leaves us with 71.
Bring next digit (3) of the dividend behind the 71 and repeat the process: 713 / 991

Going ahead to step 3:
The number 991 fits into 713 0 times, leaving a remainder of 713.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 713 leaves us with 713.
Take the next digit (4) from the dividend and append it to 713, then repeat: 7134 / 991

Advancing to step 4:
991 can be fit into 7134 7 times, resulting in a remainder of 197.
Use 7 as the next digit of our solution. 
Result so far: 7.0
Subtracting 6937 from 7134 leaves us with 197.
Bring next digit (9) of the dividend behind the 197 and repeat the process: 1979 / 991

Let's proceed to step 5:
If we divide 1979 by 991, we get 1 and a remainder of 988.
The number 1 becomes the next digit in our result. 
Result so far: 71.0
If we subtract 991 from 1979, we get 988.
Include the next digit (0) from the dividend after 988, then repeat: 9880 / 991

Going ahead to step 6:
991 can be fit into 9880 9 times, resulting in a remainder of 961.
The next digit of our result is 9. 
Result so far: 719.0
Deduct 8919 from 9880 and we're left with 961.
Append the next digit (5) from the dividend to 961 and continue with: 9615 / 991

Going ahead to step 7:
991 goes into 9615 9 times with a remainder of 696.
Put 9 as the next digit of the answer. 
Result so far: 7199.0
Subtracting 8919 from 9615 leaves us with 696.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6960, and continue the process.

Moving on to step 8:
991 can be fit into 6960 7 times, resulting in a remainder of 23.
Record the quotient 7 as the next digit in the result. 
Result so far: 7199.7
Subtract 6937 from 6960 to get 23.
Since there are no more digits in the dividend, we add a zero to the remainder making it 230, and continue the process.

On to step 9:
The number 991 fits into 230 0 times, leaving a remainder of 230.
The next digit of our result is 0. 
Result so far: 7199.7
Deduct 0 from 230 and we're left with 230.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2300, and continue the process.

Let's proceed to step 10:
If we divide 2300 by 991, we get 2 and a remainder of 318.
Record the quotient 2 as the next digit in the result. 
Result so far: 7199.702
Subtract 1982 from 2300 to get 318.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3180, and continue the process.

Step 11:
3180 divided by 991 is 3 with a remainder of 207.
Write down 3 as next digit of the result. 
Result so far: 7199.7023
Deduct 2973 from 3180 and we're left with 207.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2070, and continue the process.

Going ahead to step 12:
991 can be fit into 2070 2 times, resulting in a remainder of 88.
The number 2 becomes the next digit in our result. 
Result so far: 7199.70232
Subtracting 1982 from 2070 leaves us with 88.
Since there are no more digits in the dividend, we add a zero to the remainder making it 880, and continue the process.

Going ahead to step 13:
991 can be fit into 880 0 times, resulting in a remainder of 880.
Write down 0 as next digit of the result. 
Result so far: 7199.70232
The remainder is 880 after subtracting 0 from 880.
Since there are no more digits in the dividend, we add a zero to the remainder making it 8800, and continue the process.

Advancing to step 14:
991 goes into 8800 8 times with a remainder of 872.
The number 8 becomes the next digit in our result. 
Result so far: 7199.7023208
The remainder is 872 after subtracting 7928 from 8800.
Since there are no more digits in the dividend, we add a zero to the remainder making it 8720, and continue the process.

Moving on to step 15:
991 can be fit into 8720 8 times, resulting in a remainder of 792.
Put 8 as the next digit of the answer. 
Result so far: 7199.70232088
If we subtract 7928 from 8720, we get 792.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7920, and continue the process.

After the division, we end up with 7199.70232088 and a remainder of 7.92e-07.