We divide 643430 by 9
We want to divide 643430 by 9.

Let's proceed to step 1:
6 divided by 9 is 0 with a remainder of 6.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 6 and we're left with 6.
Include the next digit (4) from the dividend after 6, then repeat: 64 / 9

On to step 2:
When dividing 64 by 9, we get 7 with a remainder of 1.
The next digit of our result is 7. 
Result so far: 7.0
If we take 63 away from 64, we end up with 1.
Bring next digit (3) of the dividend behind the 1 and repeat the process: 13 / 9

Let's proceed to step 3:
9 can be fit into 13 1 times, resulting in a remainder of 4.
Put 1 as the next digit of the answer. 
Result so far: 71.0
Subtract 9 from 13 to get 4.
Take the next digit (4) from the dividend and append it to 4, then repeat: 44 / 9

Going ahead to step 4:
If we divide 44 by 9, we get 4 and a remainder of 8.
Write down 4 as next digit of the result. 
Result so far: 714.0
Subtracting 36 from 44 leaves us with 8.
Take the next digit (3) from the dividend and append it to 8, then repeat: 83 / 9

Going ahead to step 5:
If we divide 83 by 9, we get 9 and a remainder of 2.
Write down 9 as next digit of the result. 
Result so far: 7149.0
If we subtract 81 from 83, we get 2.
Grab the next digit (0) from the dividend, add it to 2, then carry on: 20 / 9

Advancing to step 6:
20 divided by 9 is 2 with a remainder of 2.
The next digit of our result is 2. 
Result so far: 71492.0
Subtract 18 from 20 to 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.

Moving on to step 7:
When dividing 20 by 9, we get 2 with a remainder of 2.
The number 2 becomes the next digit in our result. 
Result so far: 71492.2
The remainder is 2 after subtracting 18 from 20.
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:
If we divide 20 by 9, we get 2 and a remainder of 2.
Record the quotient 2 as the next digit in the result. 
Result so far: 71492.22
If we subtract 18 from 20, 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.

The quotient of the division is 71492.22, and the remainder is 0.002.