We're dividing 285589 by 90 
Let's see how many times 90 fits into 285589.

Advancing to step 1:
The number 90 fits into 2 0 times, leaving a remainder of 2.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 2 leaves us with 2.
Grab the next digit (8) from the dividend, add it to 2, then carry on: 28 / 90

On to step 2:
28 divided by 90 is 0 with a remainder of 28.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 28 to get 28.
Grab the next digit (5) from the dividend, add it to 28, then carry on: 285 / 90

Advancing to step 3:
90 can be fit into 285 3 times, resulting in a remainder of 15.
Put 3 as the next digit of the answer. 
Result so far: 3.0
Subtracting 270 from 285 leaves us with 15.
Grab the next digit (5) from the dividend, add it to 15, then carry on: 155 / 90

Step 4:
If we divide 155 by 90, we get 1 and a remainder of 65.
Use 1 as the next digit of our solution. 
Result so far: 31.0
Subtract 90 from 155 to get 65.
Fetch the next digit (8) from the dividend, attach it to 65 and continue: 658 / 90

Going ahead to step 5:
90 can be fit into 658 7 times, resulting in a remainder of 28.
Use 7 as the next digit of our solution. 
Result so far: 317.0
Subtracting 630 from 658 leaves us with 28.
Bring next digit (9) of the dividend behind the 28 and repeat the process: 289 / 90

On to step 6:
If we divide 289 by 90, we get 3 and a remainder of 19.
Write down 3 as next digit of the result. 
Result so far: 3173.0
If we take 270 away from 289, we end up with 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

Going ahead to step 7:
190 divided by 90 is 2 with a remainder of 10.
The number 2 becomes the next digit in our result. 
Result so far: 3173.2
Deduct 180 from 190 and we're left 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.

Going ahead to step 8:
If we divide 100 by 90, we get 1 and a remainder of 10.
Record the quotient 1 as the next digit in the result. 
Result so far: 3173.21
Subtracting 90 from 100 leaves us 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.

Going ahead to step 9:
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: 3173.211
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.

After the division, we end up with 3173.211 and a remainder of 0.001.