961391 divided by 99 
The aim is to understand the frequency of 99 in 961391.

Step 1:
99 goes into 9 0 times with a remainder of 9.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 9 and we're left with 9.
Bring next digit (6) of the dividend behind the 9 and repeat the process: 96 / 99

On to step 2:
If we divide 96 by 99, we get 0 and a remainder of 96.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 96, we get 96.
Fetch the next digit (1) from the dividend, attach it to 96 and continue: 961 / 99

Advancing to step 3:
When dividing 961 by 99, we get 9 with a remainder of 70.
Use 9 as the next digit of our solution. 
Result so far: 9.0
Subtract 891 from 961 to get 70.
Bring next digit (3) of the dividend behind the 70 and repeat the process: 703 / 99

Moving on to step 4:
If we divide 703 by 99, we get 7 and a remainder of 10.
Write down 7 as next digit of the result. 
Result so far: 97.0
If we subtract 693 from 703, we get 10.
Append the next digit (9) from the dividend to 10 and continue with: 109 / 99

On to step 5:
When dividing 109 by 99, we get 1 with a remainder of 10.
The number 1 becomes the next digit in our result. 
Result so far: 971.0
Deduct 99 from 109 and we're left with 10.
Fetch the next digit (1) from the dividend, attach it to 10 and continue: 101 / 99

Let's proceed to step 6:
101 divided by 99 is 1 with a remainder of 2.
The next digit of our result is 1. 
Result so far: 9711.0
If we subtract 99 from 101, we get 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Moving on to step 7:
When dividing 20 by 99, we get 0 with a remainder of 20.
Put 0 as the next digit of the answer. 
Result so far: 9711.0
The remainder is 20 after subtracting 0 from 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Moving on to step 8:
99 goes into 200 2 times with a remainder of 2.
The next digit of our result is 2. 
Result so far: 9711.02
If we take 198 away from 200, we end up with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Let's proceed to step 9:
When dividing 20 by 99, we get 0 with a remainder of 20.
The number 0 becomes the next digit in our result. 
Result so far: 9711.02
Subtract 0 from 20 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.

Moving on to step 10:
When dividing 200 by 99, we get 2 with a remainder of 2.
Record the quotient 2 as the next digit in the result. 
Result so far: 9711.0202
Deduct 198 from 200 and we're left with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Moving on to step 11:
If we divide 20 by 99, we get 0 and a remainder of 20.
Put 0 as the next digit of the answer. 
Result so far: 9711.0202
Subtracting 0 from 20 leaves us with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Advancing to step 12:
99 goes into 200 2 times with a remainder of 2.
The next digit of our result is 2. 
Result so far: 9711.020202
The remainder is 2 after subtracting 198 from 200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Advancing to step 13:
99 can be fit into 20 0 times, resulting in a remainder of 20.
The number 0 becomes the next digit in our result. 
Result so far: 9711.020202
If we subtract 0 from 20, we 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 14:
99 can be fit into 200 2 times, resulting in a remainder of 2.
Record the quotient 2 as the next digit in the result. 
Result so far: 9711.02020202
Subtract 198 from 200 to get 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Our division results in 9711.02020202 with a remaining 2e-09.