We look at the division of 648603 by 3 
We want to divide 648603 by 3.

Advancing to step 1:
6 divided by 3 is 2 with a remainder of 0.
Put 2 as the next digit of the answer. 
Result so far: 2.0
Deduct 6 from 6 and we're left with 0.
Take the next digit (4) from the dividend and append it to 0, then repeat: 4 / 3

Going ahead to step 2:
4 divided by 3 is 1 with a remainder of 1.
The next digit of our result is 1. 
Result so far: 21.0
Subtracting 3 from 4 leaves us with 1.
Grab the next digit (8) from the dividend, add it to 1, then carry on: 18 / 3

Step 3:
The number 3 fits into 18 6 times, leaving a remainder of 0.
Put 6 as the next digit of the answer. 
Result so far: 216.0
Deduct 18 from 18 and we're left with 0.
Take the next digit (6) from the dividend and append it to 0, then repeat: 6 / 3

Moving on to step 4:
If we divide 6 by 3, we get 2 and a remainder of 0.
The number 2 becomes the next digit in our result. 
Result so far: 2162.0
Subtracting 6 from 6 leaves us with 0.
Grab the next digit (0) from the dividend, add it to 0, then carry on: 0 / 3

Step 5:
3 goes into 0 0 times with a remainder of 0.
The next digit of our result is 0. 
Result so far: 21620.0
The remainder is 0 after subtracting 0 from 0.
Bring next digit (3) of the dividend behind the 0 and repeat the process: 3 / 3

Moving on to step 6:
If we divide 3 by 3, we get 1 and a remainder of 0.
The number 1 becomes the next digit in our result. 
Result so far: 216201.0
Subtract 3 from 3 to 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.

On to step 7:
3 goes into 0 0 times with a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 216201.0
Subtract 0 from 0 to 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.

Moving on to step 8:
If we divide 0 by 3, we get 0 and a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 216201.0
Subtract 0 from 0 to 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.

After the division, we end up with 216201.0 and a remainder of 0.0.