400003 divided by 42 
We want to divide 400003 by 42.

Let's proceed to step 1:
42 can be fit into 4 0 times, resulting in a remainder of 4.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 4 leaves us with 4.
Take the next digit (0) from the dividend and append it to 4, then repeat: 40 / 42

On to step 2:
40 divided by 42 is 0 with a remainder of 40.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 40, we end up with 40.
Append the next digit (0) from the dividend to 40 and continue with: 400 / 42

On to step 3:
The number 42 fits into 400 9 times, leaving a remainder of 22.
Use 9 as the next digit of our solution. 
Result so far: 9.0
If we take 378 away from 400, we end up with 22.
Include the next digit (0) from the dividend after 22, then repeat: 220 / 42

Step 4:
If we divide 220 by 42, we get 5 and a remainder of 10.
Record the quotient 5 as the next digit in the result. 
Result so far: 95.0
Subtract 210 from 220 to get 10.
Bring next digit (0) of the dividend behind the 10 and repeat the process: 100 / 42

On to step 5:
100 divided by 42 is 2 with a remainder of 16.
The next digit of our result is 2. 
Result so far: 952.0
If we subtract 84 from 100, we get 16.
Grab the next digit (3) from the dividend, add it to 16, then carry on: 163 / 42

Step 6:
42 goes into 163 3 times with a remainder of 37.
Write down 3 as next digit of the result. 
Result so far: 9523.0
If we take 126 away from 163, we end up with 37.
Since there are no more digits in the dividend, we add a zero to the remainder making it 370, and continue the process.

Moving on to step 7:
The number 42 fits into 370 8 times, leaving a remainder of 34.
Record the quotient 8 as the next digit in the result. 
Result so far: 9523.8
Subtract 336 from 370 to get 34.
Since there are no more digits in the dividend, we add a zero to the remainder making it 340, and continue the process.

Step 8:
The number 42 fits into 340 8 times, leaving a remainder of 4.
Write down 8 as next digit of the result. 
Result so far: 9523.88
If we take 336 away from 340, we end up with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

The quotient of the division is 9523.88, and the remainder is 0.004.