We look at the division of 643461 by 3 
We want to divide 643461 by 3.

On to step 1:
3 goes into 6 2 times with a remainder of 0.
Record the quotient 2 as the next digit in the result. 
Result so far: 2.0
Deduct 6 from 6 and we're left with 0.
Bring next digit (4) of the dividend behind the 0 and repeat the process: 4 / 3

Step 2:
3 goes into 4 1 times with a remainder of 1.
Write down 1 as next digit of the result. 
Result so far: 21.0
Subtract 3 from 4 to get 1.
Append the next digit (3) from the dividend to 1 and continue with: 13 / 3

Step 3:
When dividing 13 by 3, we get 4 with a remainder of 1.
Record the quotient 4 as the next digit in the result. 
Result so far: 214.0
Deduct 12 from 13 and we're left with 1.
Fetch the next digit (4) from the dividend, attach it to 1 and continue: 14 / 3

Going ahead to step 4:
If we divide 14 by 3, we get 4 and a remainder of 2.
The number 4 becomes the next digit in our result. 
Result so far: 2144.0
If we take 12 away from 14, we end up with 2.
Grab the next digit (6) from the dividend, add it to 2, then carry on: 26 / 3

On to step 5:
When dividing 26 by 3, we get 8 with a remainder of 2.
Put 8 as the next digit of the answer. 
Result so far: 21448.0
If we subtract 24 from 26, we get 2.
Include the next digit (1) from the dividend after 2, then repeat: 21 / 3

Step 6:
When dividing 21 by 3, we get 7 with a remainder of 0.
Write down 7 as next digit of the result. 
Result so far: 214487.0
If we subtract 21 from 21, we get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Advancing to step 7:
3 can be fit into 0 0 times, resulting in a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 214487.0
If we take 0 away from 0, we end up with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Let's proceed to step 8:
3 goes into 0 0 times with a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 214487.0
Subtracting 0 from 0 leaves us with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Our division results in 214487.0 with a remaining 0.0.