Let's divide 673640 by 90
We're looking to find how many times 90 goes into 673640.

Going ahead to step 1:
6 divided by 90 is 0 with a remainder of 6.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 6 after subtracting 0 from 6.
Bring next digit (7) of the dividend behind the 6 and repeat the process: 67 / 90

Going ahead to step 2:
90 can be fit into 67 0 times, resulting in a remainder of 67.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 67 and we're left with 67.
Append the next digit (3) from the dividend to 67 and continue with: 673 / 90

Moving on to step 3:
90 goes into 673 7 times with a remainder of 43.
The next digit of our result is 7. 
Result so far: 7.0
Subtracting 630 from 673 leaves us with 43.
Include the next digit (6) from the dividend after 43, then repeat: 436 / 90

Let's proceed to step 4:
When dividing 436 by 90, we get 4 with a remainder of 76.
Write down 4 as next digit of the result. 
Result so far: 74.0
If we subtract 360 from 436, we get 76.
Bring next digit (4) of the dividend behind the 76 and repeat the process: 764 / 90

Moving on to step 5:
If we divide 764 by 90, we get 8 and a remainder of 44.
The next digit of our result is 8. 
Result so far: 748.0
Subtract 720 from 764 to get 44.
Grab the next digit (0) from the dividend, add it to 44, then carry on: 440 / 90

Advancing to step 6:
If we divide 440 by 90, we get 4 and a remainder of 80.
The next digit of our result is 4. 
Result so far: 7484.0
Deduct 360 from 440 and we're left 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.

Advancing to step 7:
800 divided by 90 is 8 with a remainder of 80.
Write down 8 as next digit of the result. 
Result so far: 7484.8
If we take 720 away from 800, 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.

Going ahead to step 8:
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: 7484.88
The remainder is 80 after subtracting 720 from 800.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

In conclusion, the division gives 7484.88 with a balance of 0.08.