We look at the division of 243112 by 90 
We want to figure out the number of times 243112 can be divided by 90.

Advancing to step 1:
90 can be fit into 2 0 times, resulting in a remainder of 2.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 2, we get 2.
Bring next digit (4) of the dividend behind the 2 and repeat the process: 24 / 90

Step 2:
The number 90 fits into 24 0 times, leaving a remainder of 24.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 24 after subtracting 0 from 24.
Include the next digit (3) from the dividend after 24, then repeat: 243 / 90

Let's proceed to step 3:
When dividing 243 by 90, we get 2 with a remainder of 63.
The next digit of our result is 2. 
Result so far: 2.0
The remainder is 63 after subtracting 180 from 243.
Take the next digit (1) from the dividend and append it to 63, then repeat: 631 / 90

On to step 4:
The number 90 fits into 631 7 times, leaving a remainder of 1.
Use 7 as the next digit of our solution. 
Result so far: 27.0
If we take 630 away from 631, we end up with 1.
Grab the next digit (1) from the dividend, add it to 1, then carry on: 11 / 90

Advancing to step 5:
11 divided by 90 is 0 with a remainder of 11.
Put 0 as the next digit of the answer. 
Result so far: 270.0
Deduct 0 from 11 and we're left with 11.
Grab the next digit (2) from the dividend, add it to 11, then carry on: 112 / 90

Let's proceed to step 6:
90 goes into 112 1 times with a remainder of 22.
The next digit of our result is 1. 
Result so far: 2701.0
If we take 90 away from 112, we end up with 22.
Since there are no more digits in the dividend, we add a zero to the remainder making it 220, and continue the process.

Moving on to step 7:
90 can be fit into 220 2 times, resulting in a remainder of 40.
Put 2 as the next digit of the answer. 
Result so far: 2701.2
If we subtract 180 from 220, we get 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Let's proceed to step 8:
90 goes into 400 4 times with a remainder of 40.
Record the quotient 4 as the next digit in the result. 
Result so far: 2701.24
If we take 360 away from 400, we end up with 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Going ahead to step 9:
If we divide 400 by 90, we get 4 and a remainder of 40.
Write down 4 as next digit of the result. 
Result so far: 2701.244
Deduct 360 from 400 and we're left with 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

After the division, we end up with 2701.244 and a remainder of 0.004.