Let's divide 83840 by 90
We want to figure out the number of times 83840 can be divided by 90.

Step 1:
If we divide 8 by 90, we get 0 and a remainder of 8.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 8 and we're left with 8.
Take the next digit (3) from the dividend and append it to 8, then repeat: 83 / 90

Moving on to step 2:
If we divide 83 by 90, we get 0 and a remainder of 83.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 83 and we're left with 83.
Grab the next digit (8) from the dividend, add it to 83, then carry on: 838 / 90

On to step 3:
The number 90 fits into 838 9 times, leaving a remainder of 28.
Use 9 as the next digit of our solution. 
Result so far: 9.0
Subtracting 810 from 838 leaves us with 28.
Include the next digit (4) from the dividend after 28, then repeat: 284 / 90

Going ahead to step 4:
When dividing 284 by 90, we get 3 with a remainder of 14.
The next digit of our result is 3. 
Result so far: 93.0
If we take 270 away from 284, we end up with 14.
Append the next digit (0) from the dividend to 14 and continue with: 140 / 90

Going ahead to step 5:
140 divided by 90 is 1 with a remainder of 50.
The number 1 becomes the next digit in our result. 
Result so far: 931.0
Subtract 90 from 140 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.

Let's proceed to step 6:
90 can be fit into 500 5 times, resulting in a remainder of 50.
Put 5 as the next digit of the answer. 
Result so far: 931.5
Deduct 450 from 500 and we're left 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.

Let's proceed to step 7:
90 goes into 500 5 times with a remainder of 50.
Write down 5 as next digit of the result. 
Result so far: 931.55
If we take 450 away from 500, we end up 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.

The final outcome is 931.55, with a leftover of 0.05.