We're dividing 145963 by 90 
The aim is to understand the frequency of 90 in 145963.

Let's proceed to step 1:
If we divide 1 by 90, we get 0 and a remainder of 1.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 1 leaves us with 1.
Fetch the next digit (4) from the dividend, attach it to 1 and continue: 14 / 90

Going ahead to step 2:
90 goes into 14 0 times with a remainder of 14.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 14 leaves us with 14.
Bring next digit (5) of the dividend behind the 14 and repeat the process: 145 / 90

Let's proceed to step 3:
If we divide 145 by 90, we get 1 and a remainder of 55.
Use 1 as the next digit of our solution. 
Result so far: 1.0
If we take 90 away from 145, we end up with 55.
Append the next digit (9) from the dividend to 55 and continue with: 559 / 90

Step 4:
559 divided by 90 is 6 with a remainder of 19.
Put 6 as the next digit of the answer. 
Result so far: 16.0
Subtracting 540 from 559 leaves us with 19.
Take the next digit (6) from the dividend and append it to 19, then repeat: 196 / 90

Step 5:
90 can be fit into 196 2 times, resulting in a remainder of 16.
Put 2 as the next digit of the answer. 
Result so far: 162.0
Subtracting 180 from 196 leaves us with 16.
Append the next digit (3) from the dividend to 16 and continue with: 163 / 90

Advancing to step 6:
90 can be fit into 163 1 times, resulting in a remainder of 73.
The number 1 becomes the next digit in our result. 
Result so far: 1621.0
Deduct 90 from 163 and we're left with 73.
Since there are no more digits in the dividend, we add a zero to the remainder making it 730, and continue the process.

Let's proceed to step 7:
730 divided by 90 is 8 with a remainder of 10.
Put 8 as the next digit of the answer. 
Result so far: 1621.8
If we take 720 away from 730, we end up with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Advancing to step 8:
90 can be fit into 100 1 times, resulting in a remainder of 10.
Put 1 as the next digit of the answer. 
Result so far: 1621.81
Subtract 90 from 100 to get 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Moving on to step 9:
90 goes into 100 1 times with a remainder of 10.
The next digit of our result is 1. 
Result so far: 1621.811
The remainder is 10 after subtracting 90 from 100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

The quotient of the division is 1621.811, and the remainder is 0.001.