643506 divided by 7 
We're looking to find how many times 7 goes into 643506.

Step 1:
The number 7 fits into 6 0 times, leaving a remainder of 6.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 6, we end up with 6.
Take the next digit (4) from the dividend and append it to 6, then repeat: 64 / 7

Going ahead to step 2:
The number 7 fits into 64 9 times, leaving a remainder of 1.
Put 9 as the next digit of the answer. 
Result so far: 9.0
If we take 63 away from 64, we end up with 1.
Include the next digit (3) from the dividend after 1, then repeat: 13 / 7

Moving on to step 3:
13 divided by 7 is 1 with a remainder of 6.
Record the quotient 1 as the next digit in the result. 
Result so far: 91.0
The remainder is 6 after subtracting 7 from 13.
Include the next digit (5) from the dividend after 6, then repeat: 65 / 7

Moving on to step 4:
7 goes into 65 9 times with a remainder of 2.
Use 9 as the next digit of our solution. 
Result so far: 919.0
Subtract 63 from 65 to get 2.
Fetch the next digit (0) from the dividend, attach it to 2 and continue: 20 / 7

Let's proceed to step 5:
7 can be fit into 20 2 times, resulting in a remainder of 6.
The next digit of our result is 2. 
Result so far: 9192.0
Subtracting 14 from 20 leaves us with 6.
Append the next digit (6) from the dividend to 6 and continue with: 66 / 7

Advancing to step 6:
7 can be fit into 66 9 times, resulting in a remainder of 3.
Record the quotient 9 as the next digit in the result. 
Result so far: 91929.0
Deduct 63 from 66 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.

Moving on to step 7:
If we divide 30 by 7, we get 4 and a remainder of 2.
Put 4 as the next digit of the answer. 
Result so far: 91929.4
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.

On to step 8:
7 goes into 20 2 times with a remainder of 6.
The number 2 becomes the next digit in our result. 
Result so far: 91929.42
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.

Advancing to step 9:
7 goes into 60 8 times with a remainder of 4.
The number 8 becomes the next digit in our result. 
Result so far: 91929.428
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.

On to step 10:
When dividing 40 by 7, we get 5 with a remainder of 5.
Write down 5 as next digit of the result. 
Result so far: 91929.4285
Deduct 35 from 40 and we're left 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.

On to step 11:
50 divided by 7 is 7 with a remainder of 1.
Write down 7 as next digit of the result. 
Result so far: 91929.42857
If we take 49 away from 50, we end up 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.

Moving on to step 12:
7 goes into 10 1 times with a remainder of 3.
Put 1 as the next digit of the answer. 
Result so far: 91929.428571
Subtracting 7 from 10 leaves us 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.

Advancing to step 13:
7 goes into 30 4 times with a remainder of 2.
Use 4 as the next digit of our solution. 
Result so far: 91929.4285714
If we take 28 away from 30, we end up 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:
7 can be fit into 20 2 times, resulting in a remainder of 6.
Record the quotient 2 as the next digit in the result. 
Result so far: 91929.42857142
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.

The final outcome is 91929.42857142, with a leftover of 6e-09.