We're dividing 990640 by 84 
Let's see how many times 84 fits into 990640.

Advancing to step 1:
If we divide 9 by 84, we get 0 and a remainder of 9.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 9 after subtracting 0 from 9.
Fetch the next digit (9) from the dividend, attach it to 9 and continue: 99 / 84

On to step 2:
84 goes into 99 1 times with a remainder of 15.
Use 1 as the next digit of our solution. 
Result so far: 1.0
Deduct 84 from 99 and we're left with 15.
Grab the next digit (0) from the dividend, add it to 15, then carry on: 150 / 84

Let's proceed to step 3:
When dividing 150 by 84, we get 1 with a remainder of 66.
Record the quotient 1 as the next digit in the result. 
Result so far: 11.0
Subtract 84 from 150 to get 66.
Bring next digit (6) of the dividend behind the 66 and repeat the process: 666 / 84

Let's proceed to step 4:
666 divided by 84 is 7 with a remainder of 78.
Write down 7 as next digit of the result. 
Result so far: 117.0
If we take 588 away from 666, we end up with 78.
Fetch the next digit (4) from the dividend, attach it to 78 and continue: 784 / 84

On to step 5:
When dividing 784 by 84, we get 9 with a remainder of 28.
Put 9 as the next digit of the answer. 
Result so far: 1179.0
Deduct 756 from 784 and we're left with 28.
Grab the next digit (0) from the dividend, add it to 28, then carry on: 280 / 84

Advancing to step 6:
When dividing 280 by 84, we get 3 with a remainder of 28.
Put 3 as the next digit of the answer. 
Result so far: 11793.0
Subtract 252 from 280 to get 28.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

Let's proceed to step 7:
84 goes into 280 3 times with a remainder of 28.
Record the quotient 3 as the next digit in the result. 
Result so far: 11793.3
The remainder is 28 after subtracting 252 from 280.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

Step 8:
When dividing 280 by 84, we get 3 with a remainder of 28.
Record the quotient 3 as the next digit in the result. 
Result so far: 11793.33
Deduct 252 from 280 and we're left with 28.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

The final outcome is 11793.33, with a leftover of 0.028.