We look at the division of 643982 by 7 
We're looking to find how many times 7 goes into 643982.

Going ahead to step 1:
When dividing 6 by 7, we get 0 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.
Grab the next digit (4) from the dividend, add it to 6, then carry on: 64 / 7

On to step 2:
The number 7 fits into 64 9 times, leaving a remainder of 1.
Write down 9 as next digit of the result. 
Result so far: 9.0
The remainder is 1 after subtracting 63 from 64.
Fetch the next digit (3) from the dividend, attach it to 1 and continue: 13 / 7

Advancing to step 3:
13 divided by 7 is 1 with a remainder of 6.
The number 1 becomes the next digit in our result. 
Result so far: 91.0
Subtracting 7 from 13 leaves us with 6.
Include the next digit (9) from the dividend after 6, then repeat: 69 / 7

Step 4:
The number 7 fits into 69 9 times, leaving a remainder of 6.
Record the quotient 9 as the next digit in the result. 
Result so far: 919.0
If we subtract 63 from 69, we get 6.
Bring next digit (8) of the dividend behind the 6 and repeat the process: 68 / 7

Step 5:
The number 7 fits into 68 9 times, leaving a remainder of 5.
Use 9 as the next digit of our solution. 
Result so far: 9199.0
The remainder is 5 after subtracting 63 from 68.
Append the next digit (2) from the dividend to 5 and continue with: 52 / 7

Advancing to step 6:
If we divide 52 by 7, we get 7 and a remainder of 3.
Put 7 as the next digit of the answer. 
Result so far: 91997.0
If we subtract 49 from 52, 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:
30 divided by 7 is 4 with a remainder of 2.
Put 4 as the next digit of the answer. 
Result so far: 91997.4
If we subtract 28 from 30, we get 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 8:
20 divided by 7 is 2 with a remainder of 6.
Put 2 as the next digit of the answer. 
Result so far: 91997.42
If we take 14 away from 20, we end up 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.

Advancing to step 9:
The number 7 fits into 60 8 times, leaving a remainder of 4.
The number 8 becomes the next digit in our result. 
Result so far: 91997.428
If we subtract 56 from 60, we get 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Moving on to step 10:
The number 7 fits into 40 5 times, leaving a remainder of 5.
Record the quotient 5 as the next digit in the result. 
Result so far: 91997.4285
If we subtract 35 from 40, we get 5.
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:
If we divide 50 by 7, we get 7 and a remainder of 1.
Put 7 as the next digit of the answer. 
Result so far: 91997.42857
Subtracting 49 from 50 leaves us with 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Step 12:
7 can be fit into 10 1 times, resulting in a remainder of 3.
The next digit of our result is 1. 
Result so far: 91997.428571
Deduct 7 from 10 and we're left with 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:
If we divide 30 by 7, we get 4 and a remainder of 2.
The number 4 becomes the next digit in our result. 
Result so far: 91997.4285714
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.

Going ahead to step 14:
20 divided by 7 is 2 with a remainder of 6.
Put 2 as the next digit of the answer. 
Result so far: 91997.42857142
Deduct 14 from 20 and we're left 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.

After the division, we end up with 91997.42857142 and a remainder of 6e-09.