We divide 639110 by 86
We're looking to find how many times 86 goes into 639110.

Step 1:
If we divide 6 by 86, we get 0 and a remainder of 6.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 6, we end up with 6.
Take the next digit (3) from the dividend and append it to 6, then repeat: 63 / 86

On to step 2:
86 can be fit into 63 0 times, resulting in a remainder of 63.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 63 to get 63.
Take the next digit (9) from the dividend and append it to 63, then repeat: 639 / 86

Going ahead to step 3:
86 goes into 639 7 times with a remainder of 37.
The next digit of our result is 7. 
Result so far: 7.0
If we take 602 away from 639, we end up with 37.
Fetch the next digit (1) from the dividend, attach it to 37 and continue: 371 / 86

Moving on to step 4:
When dividing 371 by 86, we get 4 with a remainder of 27.
The number 4 becomes the next digit in our result. 
Result so far: 74.0
If we subtract 344 from 371, we get 27.
Bring next digit (1) of the dividend behind the 27 and repeat the process: 271 / 86

Let's proceed to step 5:
When dividing 271 by 86, we get 3 with a remainder of 13.
The number 3 becomes the next digit in our result. 
Result so far: 743.0
The remainder is 13 after subtracting 258 from 271.
Grab the next digit (0) from the dividend, add it to 13, then carry on: 130 / 86

On to step 6:
When dividing 130 by 86, we get 1 with a remainder of 44.
Put 1 as the next digit of the answer. 
Result so far: 7431.0
The remainder is 44 after subtracting 86 from 130.
Since there are no more digits in the dividend, we add a zero to the remainder making it 440, and continue the process.

Step 7:
The number 86 fits into 440 5 times, leaving a remainder of 10.
The next digit of our result is 5. 
Result so far: 7431.5
If we take 430 away from 440, we end up with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

On to step 8:
86 goes into 100 1 times with a remainder of 14.
The number 1 becomes the next digit in our result. 
Result so far: 7431.51
If we take 86 away from 100, we end up with 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Going ahead to step 9:
86 can be fit into 140 1 times, resulting in a remainder of 54.
The number 1 becomes the next digit in our result. 
Result so far: 7431.511
If we subtract 86 from 140, we get 54.
Since there are no more digits in the dividend, we add a zero to the remainder making it 540, and continue the process.

The final result is 7431.511 with a remainder of 0.0054.