Let's divide 639870 by 89
Our goal is to divide 639870 by 89.

On to step 1:
6 divided by 89 is 0 with a remainder of 6.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 6, we get 6.
Fetch the next digit (3) from the dividend, attach it to 6 and continue: 63 / 89

On to step 2:
The number 89 fits into 63 0 times, leaving a remainder of 63.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 63, we end up with 63.
Bring next digit (9) of the dividend behind the 63 and repeat the process: 639 / 89

Moving on to step 3:
If we divide 639 by 89, we get 7 and a remainder of 16.
The next digit of our result is 7. 
Result so far: 7.0
Deduct 623 from 639 and we're left with 16.
Fetch the next digit (8) from the dividend, attach it to 16 and continue: 168 / 89

Going ahead to step 4:
89 goes into 168 1 times with a remainder of 79.
Put 1 as the next digit of the answer. 
Result so far: 71.0
Subtract 89 from 168 to get 79.
Fetch the next digit (7) from the dividend, attach it to 79 and continue: 797 / 89

Let's proceed to step 5:
When dividing 797 by 89, we get 8 with a remainder of 85.
Put 8 as the next digit of the answer. 
Result so far: 718.0
Deduct 712 from 797 and we're left with 85.
Append the next digit (0) from the dividend to 85 and continue with: 850 / 89

Step 6:
If we divide 850 by 89, we get 9 and a remainder of 49.
Write down 9 as next digit of the result. 
Result so far: 7189.0
If we subtract 801 from 850, we get 49.
Since there are no more digits in the dividend, we add a zero to the remainder making it 490, and continue the process.

Going ahead to step 7:
The number 89 fits into 490 5 times, leaving a remainder of 45.
Write down 5 as next digit of the result. 
Result so far: 7189.5
Subtract 445 from 490 to get 45.
Since there are no more digits in the dividend, we add a zero to the remainder making it 450, and continue the process.

Going ahead to step 8:
450 divided by 89 is 5 with a remainder of 5.
Use 5 as the next digit of our solution. 
Result so far: 7189.55
If we take 445 away from 450, we end up with 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

After the division, we end up with 7189.55 and a remainder of 0.005.