We divide 641830 by 3
We want to figure out the number of times 641830 can be divided by 3.

Let's proceed to step 1:
The number 3 fits into 6 2 times, leaving a remainder of 0.
Put 2 as the next digit of the answer. 
Result so far: 2.0
If we subtract 6 from 6, we get 0.
Take the next digit (4) from the dividend and append it to 0, then repeat: 4 / 3

On to step 2:
The number 3 fits into 4 1 times, leaving a remainder of 1.
Write down 1 as next digit of the result. 
Result so far: 21.0
Deduct 3 from 4 and we're left with 1.
Bring next digit (1) of the dividend behind the 1 and repeat the process: 11 / 3

Advancing to step 3:
When dividing 11 by 3, we get 3 with a remainder of 2.
The next digit of our result is 3. 
Result so far: 213.0
If we take 9 away from 11, we end up with 2.
Bring next digit (8) of the dividend behind the 2 and repeat the process: 28 / 3

Let's proceed to step 4:
When dividing 28 by 3, we get 9 with a remainder of 1.
The next digit of our result is 9. 
Result so far: 2139.0
If we take 27 away from 28, we end up with 1.
Include the next digit (3) from the dividend after 1, then repeat: 13 / 3

On to step 5:
3 can be fit into 13 4 times, resulting in a remainder of 1.
Write down 4 as next digit of the result. 
Result so far: 21394.0
If we take 12 away from 13, we end up with 1.
Take the next digit (0) from the dividend and append it to 1, then repeat: 10 / 3

Let's proceed to step 6:
10 divided by 3 is 3 with a remainder of 1.
Write down 3 as next digit of the result. 
Result so far: 213943.0
Deduct 9 from 10 and we're left 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 7:
If we divide 10 by 3, we get 3 and a remainder of 1.
The number 3 becomes the next digit in our result. 
Result so far: 213943.3
The remainder is 1 after subtracting 9 from 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

On to step 8:
If we divide 10 by 3, we get 3 and a remainder of 1.
Put 3 as the next digit of the answer. 
Result so far: 213943.33
Deduct 9 from 10 and we're left 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.

The quotient of the division is 213943.33, and the remainder is 0.001.