Let's divide 580370 by 90
Let's see how many times 90 fits into 580370.

Step 1:
5 divided by 90 is 0 with a remainder of 5.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 5 leaves us with 5.
Grab the next digit (8) from the dividend, add it to 5, then carry on: 58 / 90

Moving on to step 2:
If we divide 58 by 90, we get 0 and a remainder of 58.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 58 and we're left with 58.
Include the next digit (0) from the dividend after 58, then repeat: 580 / 90

Advancing to step 3:
If we divide 580 by 90, we get 6 and a remainder of 40.
The number 6 becomes the next digit in our result. 
Result so far: 6.0
Subtracting 540 from 580 leaves us with 40.
Include the next digit (3) from the dividend after 40, then repeat: 403 / 90

On to step 4:
When dividing 403 by 90, we get 4 with a remainder of 43.
Put 4 as the next digit of the answer. 
Result so far: 64.0
Subtract 360 from 403 to get 43.
Include the next digit (7) from the dividend after 43, then repeat: 437 / 90

Moving on to step 5:
90 goes into 437 4 times with a remainder of 77.
Write down 4 as next digit of the result. 
Result so far: 644.0
Subtract 360 from 437 to get 77.
Fetch the next digit (0) from the dividend, attach it to 77 and continue: 770 / 90

Advancing to step 6:
If we divide 770 by 90, we get 8 and a remainder of 50.
Put 8 as the next digit of the answer. 
Result so far: 6448.0
Subtracting 720 from 770 leaves us with 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

Step 7:
90 can be fit into 500 5 times, resulting in a remainder of 50.
Use 5 as the next digit of our solution. 
Result so far: 6448.5
Subtract 450 from 500 to get 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

Step 8:
500 divided by 90 is 5 with a remainder of 50.
Put 5 as the next digit of the answer. 
Result so far: 6448.55
Subtract 450 from 500 to get 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

The final outcome is 6448.55, with a leftover of 0.05.