We divide 42403 by 40
We want to figure out the number of times 42403 can be divided by 40.

Let's proceed to step 1:
When dividing 4 by 40, we get 0 with a remainder of 4.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 4 and we're left with 4.
Include the next digit (2) from the dividend after 4, then repeat: 42 / 40

Going ahead to step 2:
If we divide 42 by 40, we get 1 and a remainder of 2.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
Subtracting 40 from 42 leaves us with 2.
Take the next digit (4) from the dividend and append it to 2, then repeat: 24 / 40

Advancing to step 3:
40 can be fit into 24 0 times, resulting in a remainder of 24.
Put 0 as the next digit of the answer. 
Result so far: 10.0
Deduct 0 from 24 and we're left with 24.
Fetch the next digit (0) from the dividend, attach it to 24 and continue: 240 / 40

Step 4:
The number 40 fits into 240 6 times, leaving a remainder of 0.
Put 6 as the next digit of the answer. 
Result so far: 106.0
Subtracting 240 from 240 leaves us with 0.
Bring next digit (3) of the dividend behind the 0 and repeat the process: 3 / 40

Going ahead to step 5:
40 can be fit into 3 0 times, resulting in a remainder of 3.
Record the quotient 0 as the next digit in the result. 
Result so far: 1060.0
The remainder is 3 after subtracting 0 from 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Going ahead to step 6:
40 goes into 30 0 times with a remainder of 30.
Put 0 as the next digit of the answer. 
Result so far: 1060.0
If we take 0 away from 30, we end up with 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Let's proceed to step 7:
40 goes into 300 7 times with a remainder of 20.
Put 7 as the next digit of the answer. 
Result so far: 1060.07
Subtract 280 from 300 to get 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

On to step 8:
40 can be fit into 200 5 times, resulting in a remainder of 0.
Record the quotient 5 as the next digit in the result. 
Result so far: 1060.075
If we take 200 away from 200, we end up 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.

Let's proceed to step 9:
0 divided by 40 is 0 with a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 1060.075
If we subtract 0 from 0, we 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.

Let's proceed to step 10:
If we divide 0 by 40, we get 0 and a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 1060.075
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.

The quotient of the division is 1060.075, and the remainder is 0.0.