We're dividing 639013 by 90 
Let's see how many times 90 fits into 639013.

Step 1:
When dividing 6 by 90, we get 0 with a remainder of 6.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 6 after subtracting 0 from 6.
Append the next digit (3) from the dividend to 6 and continue with: 63 / 90

Advancing to step 2:
90 goes into 63 0 times with a remainder of 63.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 63, we end up with 63.
Take the next digit (9) from the dividend and append it to 63, then repeat: 639 / 90

Advancing to step 3:
639 divided by 90 is 7 with a remainder of 9.
The number 7 becomes the next digit in our result. 
Result so far: 7.0
If we take 630 away from 639, we end up with 9.
Take the next digit (0) from the dividend and append it to 9, then repeat: 90 / 90

On to step 4:
90 divided by 90 is 1 with a remainder of 0.
Write down 1 as next digit of the result. 
Result so far: 71.0
Subtract 90 from 90 to get 0.
Bring next digit (1) of the dividend behind the 0 and repeat the process: 1 / 90

Advancing to step 5:
90 can be fit into 1 0 times, resulting in a remainder of 1.
The next digit of our result is 0. 
Result so far: 710.0
Subtract 0 from 1 to get 1.
Append the next digit (3) from the dividend to 1 and continue with: 13 / 90

Moving on to step 6:
90 goes into 13 0 times with a remainder of 13.
The number 0 becomes the next digit in our result. 
Result so far: 7100.0
If we subtract 0 from 13, we get 13.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

Going ahead to step 7:
90 can be fit into 130 1 times, resulting in a remainder of 40.
Record the quotient 1 as the next digit in the result. 
Result so far: 7100.1
If we take 90 away from 130, we end up with 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Step 8:
400 divided by 90 is 4 with a remainder of 40.
The next digit of our result is 4. 
Result so far: 7100.14
Subtracting 360 from 400 leaves us with 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Going ahead to step 9:
90 can be fit into 400 4 times, resulting in a remainder of 40.
Use 4 as the next digit of our solution. 
Result so far: 7100.144
Subtract 360 from 400 to get 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

The final result is 7100.144 with a remainder of 0.004.