We're dividing 409254 by 90 
We want to figure out the number of times 409254 can be divided by 90.

Going ahead to step 1:
4 divided by 90 is 0 with a remainder of 4.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 4 after subtracting 0 from 4.
Fetch the next digit (0) from the dividend, attach it to 4 and continue: 40 / 90

Going ahead to step 2:
If we divide 40 by 90, we get 0 and a remainder of 40.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 40, we get 40.
Fetch the next digit (9) from the dividend, attach it to 40 and continue: 409 / 90

Advancing to step 3:
409 divided by 90 is 4 with a remainder of 49.
Record the quotient 4 as the next digit in the result. 
Result so far: 4.0
Subtracting 360 from 409 leaves us with 49.
Grab the next digit (2) from the dividend, add it to 49, then carry on: 492 / 90

Advancing to step 4:
The number 90 fits into 492 5 times, leaving a remainder of 42.
Write down 5 as next digit of the result. 
Result so far: 45.0
Deduct 450 from 492 and we're left with 42.
Take the next digit (5) from the dividend and append it to 42, then repeat: 425 / 90

Let's proceed to step 5:
425 divided by 90 is 4 with a remainder of 65.
Write down 4 as next digit of the result. 
Result so far: 454.0
Subtract 360 from 425 to get 65.
Fetch the next digit (4) from the dividend, attach it to 65 and continue: 654 / 90

Advancing to step 6:
When dividing 654 by 90, we get 7 with a remainder of 24.
Put 7 as the next digit of the answer. 
Result so far: 4547.0
Subtracting 630 from 654 leaves us with 24.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

Moving on to step 7:
If we divide 240 by 90, we get 2 and a remainder of 60.
Put 2 as the next digit of the answer. 
Result so far: 4547.2
The remainder is 60 after subtracting 180 from 240.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Moving on to step 8:
The number 90 fits into 600 6 times, leaving a remainder of 60.
Use 6 as the next digit of our solution. 
Result so far: 4547.26
Deduct 540 from 600 and we're left with 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Moving on to step 9:
90 can be fit into 600 6 times, resulting in a remainder of 60.
Write down 6 as next digit of the result. 
Result so far: 4547.266
If we take 540 away from 600, we end up with 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

After the division, we end up with 4547.266 and a remainder of 0.006.