403963 divided by 4 
We want to figure out the number of times 403963 can be divided by 4.

On to step 1:
The number 4 fits into 4 1 times, leaving a remainder of 0.
Put 1 as the next digit of the answer. 
Result so far: 1.0
Deduct 4 from 4 and we're left with 0.
Take the next digit (0) from the dividend and append it to 0, then repeat: 0 / 4

Let's proceed to step 2:
4 can be fit into 0 0 times, resulting in a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 10.0
The remainder is 0 after subtracting 0 from 0.
Bring next digit (3) of the dividend behind the 0 and repeat the process: 3 / 4

Moving on to step 3:
4 can be fit into 3 0 times, resulting in a remainder of 3.
Use 0 as the next digit of our solution. 
Result so far: 100.0
If we take 0 away from 3, we end up with 3.
Fetch the next digit (9) from the dividend, attach it to 3 and continue: 39 / 4

Step 4:
4 goes into 39 9 times with a remainder of 3.
Use 9 as the next digit of our solution. 
Result so far: 1009.0
If we take 36 away from 39, we end up with 3.
Append the next digit (6) from the dividend to 3 and continue with: 36 / 4

Step 5:
The number 4 fits into 36 9 times, leaving a remainder of 0.
Put 9 as the next digit of the answer. 
Result so far: 10099.0
Subtract 36 from 36 to get 0.
Append the next digit (3) from the dividend to 0 and continue with: 3 / 4

On to step 6:
If we divide 3 by 4, we get 0 and a remainder of 3.
Write down 0 as next digit of the result. 
Result so far: 100990.0
If we subtract 0 from 3, we get 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Step 7:
4 can be fit into 30 7 times, resulting in a remainder of 2.
Use 7 as the next digit of our solution. 
Result so far: 100990.7
Subtract 28 from 30 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 8:
The number 4 fits into 20 5 times, leaving a remainder of 0.
Write down 5 as next digit of the result. 
Result so far: 100990.75
Subtract 20 from 20 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 9:
When dividing 0 by 4, we get 0 with a remainder of 0.
The next digit of our result is 0. 
Result so far: 100990.75
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.

On to step 10:
0 divided by 4 is 0 with a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 100990.75
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 100990.75 with a remaining 0.0.