Let's divide 35099609 by 161
The aim is to understand the frequency of 161 in 35099609.

On to step 1:
If we divide 3 by 161, we get 0 and a remainder of 3.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 3 and we're left with 3.
Take the next digit (5) from the dividend and append it to 3, then repeat: 35 / 161

Moving on to step 2:
If we divide 35 by 161, we get 0 and a remainder of 35.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 35 and we're left with 35.
Grab the next digit (0) from the dividend, add it to 35, then carry on: 350 / 161

Advancing to step 3:
When dividing 350 by 161, we get 2 with a remainder of 28.
The next digit of our result is 2. 
Result so far: 2.0
If we subtract 322 from 350, we get 28.
Append the next digit (9) from the dividend to 28 and continue with: 289 / 161

Going ahead to step 4:
When dividing 289 by 161, we get 1 with a remainder of 128.
Put 1 as the next digit of the answer. 
Result so far: 21.0
If we take 161 away from 289, we end up with 128.
Bring next digit (9) of the dividend behind the 128 and repeat the process: 1289 / 161

Advancing to step 5:
161 can be fit into 1289 8 times, resulting in a remainder of 1.
The number 8 becomes the next digit in our result. 
Result so far: 218.0
Subtract 1288 from 1289 to get 1.
Take the next digit (6) from the dividend and append it to 1, then repeat: 16 / 161

Let's proceed to step 6:
If we divide 16 by 161, we get 0 and a remainder of 16.
The next digit of our result is 0. 
Result so far: 2180.0
Deduct 0 from 16 and we're left with 16.
Append the next digit (0) from the dividend to 16 and continue with: 160 / 161

Let's proceed to step 7:
The number 161 fits into 160 0 times, leaving a remainder of 160.
Put 0 as the next digit of the answer. 
Result so far: 21800.0
If we take 0 away from 160, we end up with 160.
Append the next digit (9) from the dividend to 160 and continue with: 1609 / 161

Step 8:
If we divide 1609 by 161, we get 9 and a remainder of 160.
The number 9 becomes the next digit in our result. 
Result so far: 218009.0
Subtracting 1449 from 1609 leaves us with 160.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1600, and continue the process.

Moving on to step 9:
When dividing 1600 by 161, we get 9 with a remainder of 151.
Put 9 as the next digit of the answer. 
Result so far: 218009.9
If we take 1449 away from 1600, we end up with 151.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1510, and continue the process.

Advancing to step 10:
161 can be fit into 1510 9 times, resulting in a remainder of 61.
The next digit of our result is 9. 
Result so far: 218009.99
The remainder is 61 after subtracting 1449 from 1510.
Since there are no more digits in the dividend, we add a zero to the remainder making it 610, and continue the process.

Our division results in 218009.99 with a remaining 0.061.