We divide 503651 by 3
We want to figure out the number of times 503651 can be divided by 3.

Step 1:
If we divide 5 by 3, we get 1 and a remainder of 2.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
Subtract 3 from 5 to get 2.
Fetch the next digit (0) from the dividend, attach it to 2 and continue: 20 / 3

Moving on to step 2:
When dividing 20 by 3, we get 6 with a remainder of 2.
Use 6 as the next digit of our solution. 
Result so far: 16.0
Subtracting 18 from 20 leaves us with 2.
Take the next digit (3) from the dividend and append it to 2, then repeat: 23 / 3

Step 3:
If we divide 23 by 3, we get 7 and a remainder of 2.
Use 7 as the next digit of our solution. 
Result so far: 167.0
Deduct 21 from 23 and we're left with 2.
Bring next digit (6) of the dividend behind the 2 and repeat the process: 26 / 3

On to step 4:
When dividing 26 by 3, we get 8 with a remainder of 2.
Write down 8 as next digit of the result. 
Result so far: 1678.0
The remainder is 2 after subtracting 24 from 26.
Take the next digit (5) from the dividend and append it to 2, then repeat: 25 / 3

Going ahead to step 5:
The number 3 fits into 25 8 times, leaving a remainder of 1.
Write down 8 as next digit of the result. 
Result so far: 16788.0
Subtract 24 from 25 to get 1.
Append the next digit (1) from the dividend to 1 and continue with: 11 / 3

Moving on to step 6:
If we divide 11 by 3, we get 3 and a remainder of 2.
Write down 3 as next digit of the result. 
Result so far: 167883.0
Subtract 9 from 11 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.

On to step 7:
When dividing 20 by 3, we get 6 with a remainder of 2.
Write down 6 as next digit of the result. 
Result so far: 167883.6
If we take 18 away from 20, we end up with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Step 8:
If we divide 20 by 3, we get 6 and a remainder of 2.
Use 6 as the next digit of our solution. 
Result so far: 167883.66
If we take 18 away from 20, we end up with 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 167883.66, and the remainder is 0.002.