643744 ÷ 3 
Let's see how many times 3 fits into 643744.

Moving on to step 1:
When dividing 6 by 3, we get 2 with a remainder of 0.
Record the quotient 2 as the next digit in the result. 
Result so far: 2.0
If we take 6 away from 6, we end up with 0.
Grab the next digit (4) from the dividend, add it to 0, then carry on: 4 / 3

Going ahead to step 2:
If we divide 4 by 3, we get 1 and a remainder of 1.
Put 1 as the next digit of the answer. 
Result so far: 21.0
Subtract 3 from 4 to get 1.
Bring next digit (3) of the dividend behind the 1 and repeat the process: 13 / 3

Step 3:
The number 3 fits into 13 4 times, leaving a remainder of 1.
Use 4 as the next digit of our solution. 
Result so far: 214.0
The remainder is 1 after subtracting 12 from 13.
Include the next digit (7) from the dividend after 1, then repeat: 17 / 3

Step 4:
If we divide 17 by 3, we get 5 and a remainder of 2.
Write down 5 as next digit of the result. 
Result so far: 2145.0
If we take 15 away from 17, we end up with 2.
Append the next digit (4) from the dividend to 2 and continue with: 24 / 3

Advancing to step 5:
If we divide 24 by 3, we get 8 and a remainder of 0.
Record the quotient 8 as the next digit in the result. 
Result so far: 21458.0
The remainder is 0 after subtracting 24 from 24.
Fetch the next digit (4) from the dividend, attach it to 0 and continue: 4 / 3

Advancing to step 6:
4 divided by 3 is 1 with a remainder of 1.
Record the quotient 1 as the next digit in the result. 
Result so far: 214581.0
The remainder is 1 after subtracting 3 from 4.
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 7:
The number 3 fits into 10 3 times, leaving a remainder of 1.
The number 3 becomes the next digit in our result. 
Result so far: 214581.3
Subtract 9 from 10 to get 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Going ahead to step 8:
The number 3 fits into 10 3 times, leaving a remainder of 1.
Write down 3 as next digit of the result. 
Result so far: 214581.33
If we take 9 away from 10, 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.

The final outcome is 214581.33, with a leftover of 0.001.