Let's divide 161705 by 90
The aim is to understand the frequency of 90 in 161705.

Advancing to step 1:
1 divided by 90 is 0 with a remainder of 1.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 1, we get 1.
Grab the next digit (6) from the dividend, add it to 1, then carry on: 16 / 90

Step 2:
If we divide 16 by 90, we get 0 and a remainder of 16.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 16 after subtracting 0 from 16.
Take the next digit (1) from the dividend and append it to 16, then repeat: 161 / 90

Let's proceed to step 3:
161 divided by 90 is 1 with a remainder of 71.
Put 1 as the next digit of the answer. 
Result so far: 1.0
The remainder is 71 after subtracting 90 from 161.
Fetch the next digit (7) from the dividend, attach it to 71 and continue: 717 / 90

Let's proceed to step 4:
When dividing 717 by 90, we get 7 with a remainder of 87.
Use 7 as the next digit of our solution. 
Result so far: 17.0
If we subtract 630 from 717, we get 87.
Take the next digit (0) from the dividend and append it to 87, then repeat: 870 / 90

Step 5:
90 can be fit into 870 9 times, resulting in a remainder of 60.
Put 9 as the next digit of the answer. 
Result so far: 179.0
Subtract 810 from 870 to get 60.
Bring next digit (5) of the dividend behind the 60 and repeat the process: 605 / 90

Let's proceed to step 6:
605 divided by 90 is 6 with a remainder of 65.
Record the quotient 6 as the next digit in the result. 
Result so far: 1796.0
If we take 540 away from 605, we end up with 65.
Since there are no more digits in the dividend, we add a zero to the remainder making it 650, and continue the process.

Let's proceed to step 7:
90 can be fit into 650 7 times, resulting in a remainder of 20.
Use 7 as the next digit of our solution. 
Result so far: 1796.7
Deduct 630 from 650 and we're left 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.

Moving on to step 8:
If we divide 200 by 90, we get 2 and a remainder of 20.
Use 2 as the next digit of our solution. 
Result so far: 1796.72
Subtracting 180 from 200 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.

Moving on to step 9:
90 can be fit into 200 2 times, resulting in a remainder of 20.
The next digit of our result is 2. 
Result so far: 1796.722
The remainder is 20 after subtracting 180 from 200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

The quotient of the division is 1796.722, and the remainder is 0.002.