We're dividing 99923586 by 161 
The aim is to understand the frequency of 161 in 99923586.

Moving on to step 1:
161 goes into 9 0 times with a remainder of 9.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 9 and we're left with 9.
Include the next digit (9) from the dividend after 9, then repeat: 99 / 161

Advancing to step 2:
The number 161 fits into 99 0 times, leaving a remainder of 99.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 99 and we're left with 99.
Grab the next digit (9) from the dividend, add it to 99, then carry on: 999 / 161

Let's proceed to step 3:
999 divided by 161 is 6 with a remainder of 33.
The next digit of our result is 6. 
Result so far: 6.0
The remainder is 33 after subtracting 966 from 999.
Take the next digit (2) from the dividend and append it to 33, then repeat: 332 / 161

On to step 4:
332 divided by 161 is 2 with a remainder of 10.
Use 2 as the next digit of our solution. 
Result so far: 62.0
If we take 322 away from 332, we end up with 10.
Include the next digit (3) from the dividend after 10, then repeat: 103 / 161

On to step 5:
161 goes into 103 0 times with a remainder of 103.
Write down 0 as next digit of the result. 
Result so far: 620.0
Subtract 0 from 103 to get 103.
Bring next digit (5) of the dividend behind the 103 and repeat the process: 1035 / 161

Step 6:
If we divide 1035 by 161, we get 6 and a remainder of 69.
The next digit of our result is 6. 
Result so far: 6206.0
The remainder is 69 after subtracting 966 from 1035.
Grab the next digit (8) from the dividend, add it to 69, then carry on: 698 / 161

Going ahead to step 7:
If we divide 698 by 161, we get 4 and a remainder of 54.
Record the quotient 4 as the next digit in the result. 
Result so far: 62064.0
If we take 644 away from 698, we end up with 54.
Include the next digit (6) from the dividend after 54, then repeat: 546 / 161

Let's proceed to step 8:
161 goes into 546 3 times with a remainder of 63.
Put 3 as the next digit of the answer. 
Result so far: 620643.0
Deduct 483 from 546 and we're left with 63.
Since there are no more digits in the dividend, we add a zero to the remainder making it 630, and continue the process.

Let's proceed to step 9:
When dividing 630 by 161, we get 3 with a remainder of 147.
Record the quotient 3 as the next digit in the result. 
Result so far: 620643.3
The remainder is 147 after subtracting 483 from 630.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1470, and continue the process.

Let's proceed to step 10:
When dividing 1470 by 161, we get 9 with a remainder of 21.
The next digit of our result is 9. 
Result so far: 620643.39
If we subtract 1449 from 1470, we get 21.
Since there are no more digits in the dividend, we add a zero to the remainder making it 210, and continue the process.

Going ahead to step 11:
When dividing 210 by 161, we get 1 with a remainder of 49.
The next digit of our result is 1. 
Result so far: 620643.391
If we take 161 away from 210, we end up with 49.
Since there are no more digits in the dividend, we add a zero to the remainder making it 490, and continue the process.

Going ahead to step 12:
If we divide 490 by 161, we get 3 and a remainder of 7.
Write down 3 as next digit of the result. 
Result so far: 620643.3913
Subtract 483 from 490 to get 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

Advancing to step 13:
70 divided by 161 is 0 with a remainder of 70.
Put 0 as the next digit of the answer. 
Result so far: 620643.3913
Subtract 0 from 70 to get 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 700, and continue the process.

Let's proceed to step 14:
161 can be fit into 700 4 times, resulting in a remainder of 56.
The next digit of our result is 4. 
Result so far: 620643.391304
The remainder is 56 after subtracting 644 from 700.
Since there are no more digits in the dividend, we add a zero to the remainder making it 560, and continue the process.

Moving on to step 15:
The number 161 fits into 560 3 times, leaving a remainder of 77.
The next digit of our result is 3. 
Result so far: 620643.3913043
The remainder is 77 after subtracting 483 from 560.
Since there are no more digits in the dividend, we add a zero to the remainder making it 770, and continue the process.

Step 16:
161 goes into 770 4 times with a remainder of 126.
Use 4 as the next digit of our solution. 
Result so far: 620643.39130434
If we take 644 away from 770, we end up with 126.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1260, and continue the process.

The final outcome is 620643.39130434, with a leftover of 1.26e-07.