We look at the division of 639999 by 7 
We want to figure out the number of times 639999 can be divided by 7.

Advancing to step 1:
7 goes into 6 0 times with a remainder of 6.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 6 after subtracting 0 from 6.
Take the next digit (3) from the dividend and append it to 6, then repeat: 63 / 7

Going ahead to step 2:
7 goes into 63 9 times with a remainder of 0.
The number 9 becomes the next digit in our result. 
Result so far: 9.0
Subtracting 63 from 63 leaves us with 0.
Bring next digit (9) of the dividend behind the 0 and repeat the process: 9 / 7

Let's proceed to step 3:
When dividing 9 by 7, we get 1 with a remainder of 2.
The number 1 becomes the next digit in our result. 
Result so far: 91.0
Subtracting 7 from 9 leaves us with 2.
Take the next digit (9) from the dividend and append it to 2, then repeat: 29 / 7

Moving on to step 4:
29 divided by 7 is 4 with a remainder of 1.
Write down 4 as next digit of the result. 
Result so far: 914.0
Subtract 28 from 29 to get 1.
Fetch the next digit (9) from the dividend, attach it to 1 and continue: 19 / 7

Let's proceed to step 5:
If we divide 19 by 7, we get 2 and a remainder of 5.
The number 2 becomes the next digit in our result. 
Result so far: 9142.0
If we take 14 away from 19, we end up with 5.
Include the next digit (9) from the dividend after 5, then repeat: 59 / 7

Step 6:
The number 7 fits into 59 8 times, leaving a remainder of 3.
Use 8 as the next digit of our solution. 
Result so far: 91428.0
If we subtract 56 from 59, we get 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Let's proceed to step 7:
When dividing 30 by 7, we get 4 with a remainder of 2.
Record the quotient 4 as the next digit in the result. 
Result so far: 91428.4
Deduct 28 from 30 and we're left with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Step 8:
The number 7 fits into 20 2 times, leaving a remainder of 6.
Record the quotient 2 as the next digit in the result. 
Result so far: 91428.42
The remainder is 6 after subtracting 14 from 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Going ahead to step 9:
7 can be fit into 60 8 times, resulting in a remainder of 4.
The number 8 becomes the next digit in our result. 
Result so far: 91428.428
The remainder is 4 after subtracting 56 from 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Going ahead to step 10:
When dividing 40 by 7, we get 5 with a remainder of 5.
The next digit of our result is 5. 
Result so far: 91428.4285
The remainder is 5 after subtracting 35 from 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Moving on to step 11:
50 divided by 7 is 7 with a remainder of 1.
Record the quotient 7 as the next digit in the result. 
Result so far: 91428.42857
The remainder is 1 after subtracting 49 from 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Let's proceed to step 12:
The number 7 fits into 10 1 times, leaving a remainder of 3.
The next digit of our result is 1. 
Result so far: 91428.428571
If we subtract 7 from 10, we get 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Step 13:
When dividing 30 by 7, we get 4 with a remainder of 2.
Write down 4 as next digit of the result. 
Result so far: 91428.4285714
Subtracting 28 from 30 leaves us with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Advancing to step 14:
7 can be fit into 20 2 times, resulting in a remainder of 6.
Use 2 as the next digit of our solution. 
Result so far: 91428.42857142
Subtracting 14 from 20 leaves us with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

The final result is 91428.42857142 with a remainder of 6e-09.