We look at the division of 358909 by 90 
We're looking to find how many times 90 goes into 358909.

Going ahead to step 1:
The number 90 fits into 3 0 times, leaving a remainder of 3.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 3 leaves us with 3.
Grab the next digit (5) from the dividend, add it to 3, then carry on: 35 / 90

Moving on to step 2:
35 divided by 90 is 0 with a remainder of 35.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 35 after subtracting 0 from 35.
Bring next digit (8) of the dividend behind the 35 and repeat the process: 358 / 90

Let's proceed to step 3:
If we divide 358 by 90, we get 3 and a remainder of 88.
Record the quotient 3 as the next digit in the result. 
Result so far: 3.0
Deduct 270 from 358 and we're left with 88.
Bring next digit (9) of the dividend behind the 88 and repeat the process: 889 / 90

On to step 4:
889 divided by 90 is 9 with a remainder of 79.
Write down 9 as next digit of the result. 
Result so far: 39.0
Deduct 810 from 889 and we're left with 79.
Take the next digit (0) from the dividend and append it to 79, then repeat: 790 / 90

On to step 5:
If we divide 790 by 90, we get 8 and a remainder of 70.
Write down 8 as next digit of the result. 
Result so far: 398.0
Subtracting 720 from 790 leaves us with 70.
Bring next digit (9) of the dividend behind the 70 and repeat the process: 709 / 90

Going ahead to step 6:
When dividing 709 by 90, we get 7 with a remainder of 79.
Put 7 as the next digit of the answer. 
Result so far: 3987.0
The remainder is 79 after subtracting 630 from 709.
Since there are no more digits in the dividend, we add a zero to the remainder making it 790, and continue the process.

On to step 7:
90 can be fit into 790 8 times, resulting in a remainder of 70.
Write down 8 as next digit of the result. 
Result so far: 3987.8
The remainder is 70 after subtracting 720 from 790.
Since there are no more digits in the dividend, we add a zero to the remainder making it 700, and continue the process.

Let's proceed to step 8:
700 divided by 90 is 7 with a remainder of 70.
Use 7 as the next digit of our solution. 
Result so far: 3987.87
Deduct 630 from 700 and we're left with 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 700, and continue the process.

Let's proceed to step 9:
90 can be fit into 700 7 times, resulting in a remainder of 70.
Put 7 as the next digit of the answer. 
Result so far: 3987.877
Deduct 630 from 700 and we're left with 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 700, and continue the process.

The quotient of the division is 3987.877, and the remainder is 0.007.