5640209 ÷ 90 
Our goal is to divide 5640209 by 90.

Going ahead to step 1:
When dividing 5 by 90, we get 0 with a remainder of 5.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 5, we get 5.
Append the next digit (6) from the dividend to 5 and continue with: 56 / 90

Moving on to step 2:
90 goes into 56 0 times with a remainder of 56.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 56 to get 56.
Append the next digit (4) from the dividend to 56 and continue with: 564 / 90

On to step 3:
90 can be fit into 564 6 times, resulting in a remainder of 24.
The number 6 becomes the next digit in our result. 
Result so far: 6.0
Subtract 540 from 564 to get 24.
Take the next digit (0) from the dividend and append it to 24, then repeat: 240 / 90

Let's proceed to step 4:
90 can be fit into 240 2 times, resulting in a remainder of 60.
Write down 2 as next digit of the result. 
Result so far: 62.0
If we subtract 180 from 240, we get 60.
Include the next digit (2) from the dividend after 60, then repeat: 602 / 90

Moving on to step 5:
90 goes into 602 6 times with a remainder of 62.
Use 6 as the next digit of our solution. 
Result so far: 626.0
If we subtract 540 from 602, we get 62.
Append the next digit (0) from the dividend to 62 and continue with: 620 / 90

Moving on to step 6:
90 goes into 620 6 times with a remainder of 80.
The number 6 becomes the next digit in our result. 
Result so far: 6266.0
If we take 540 away from 620, we end up with 80.
Fetch the next digit (9) from the dividend, attach it to 80 and continue: 809 / 90

Advancing to step 7:
If we divide 809 by 90, we get 8 and a remainder of 89.
Write down 8 as next digit of the result. 
Result so far: 62668.0
Deduct 720 from 809 and we're left with 89.
Since there are no more digits in the dividend, we add a zero to the remainder making it 890, and continue the process.

Step 8:
The number 90 fits into 890 9 times, leaving a remainder of 80.
The next digit of our result is 9. 
Result so far: 62668.9
If we take 810 away from 890, we end up with 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

Let's proceed to step 9:
90 can be fit into 800 8 times, resulting in a remainder of 80.
Put 8 as the next digit of the answer. 
Result so far: 62668.98
If we subtract 720 from 800, we get 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

Moving on to step 10:
If we divide 800 by 90, we get 8 and a remainder of 80.
Record the quotient 8 as the next digit in the result. 
Result so far: 62668.988
If we subtract 720 from 800, we get 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

The final outcome is 62668.988, with a leftover of 0.008.