403689 ÷ 42 
Our goal is to divide 403689 by 42.

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

Step 2:
40 divided by 42 is 0 with a remainder of 40.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 40 after subtracting 0 from 40.
Append the next digit (3) from the dividend to 40 and continue with: 403 / 42

Going ahead to step 3:
If we divide 403 by 42, we get 9 and a remainder of 25.
Write down 9 as next digit of the result. 
Result so far: 9.0
Subtracting 378 from 403 leaves us with 25.
Include the next digit (6) from the dividend after 25, then repeat: 256 / 42

On to step 4:
42 can be fit into 256 6 times, resulting in a remainder of 4.
Write down 6 as next digit of the result. 
Result so far: 96.0
Subtract 252 from 256 to get 4.
Bring next digit (8) of the dividend behind the 4 and repeat the process: 48 / 42

Moving on to step 5:
If we divide 48 by 42, we get 1 and a remainder of 6.
Record the quotient 1 as the next digit in the result. 
Result so far: 961.0
Deduct 42 from 48 and we're left with 6.
Take the next digit (9) from the dividend and append it to 6, then repeat: 69 / 42

Advancing to step 6:
42 goes into 69 1 times with a remainder of 27.
Write down 1 as next digit of the result. 
Result so far: 9611.0
Deduct 42 from 69 and we're left with 27.
Since there are no more digits in the dividend, we add a zero to the remainder making it 270, and continue the process.

Going ahead to step 7:
42 can be fit into 270 6 times, resulting in a remainder of 18.
The next digit of our result is 6. 
Result so far: 9611.6
Subtracting 252 from 270 leaves us with 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Advancing to step 8:
42 goes into 180 4 times with a remainder of 12.
The next digit of our result is 4. 
Result so far: 9611.64
If we subtract 168 from 180, we get 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Step 9:
If we divide 120 by 42, we get 2 and a remainder of 36.
Put 2 as the next digit of the answer. 
Result so far: 9611.642
Subtracting 84 from 120 leaves us with 36.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

Advancing to step 10:
360 divided by 42 is 8 with a remainder of 24.
The next digit of our result is 8. 
Result so far: 9611.6428
Deduct 336 from 360 and we're left with 24.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

Step 11:
42 goes into 240 5 times with a remainder of 30.
Use 5 as the next digit of our solution. 
Result so far: 9611.64285
The remainder is 30 after subtracting 210 from 240.
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 12:
The number 42 fits into 300 7 times, leaving a remainder of 6.
The next digit of our result is 7. 
Result so far: 9611.642857
Subtracting 294 from 300 leaves us with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Let's proceed to step 13:
42 can be fit into 60 1 times, resulting in a remainder of 18.
The next digit of our result is 1. 
Result so far: 9611.6428571
Subtracting 42 from 60 leaves us with 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Moving on to step 14:
The number 42 fits into 180 4 times, leaving a remainder of 12.
The next digit of our result is 4. 
Result so far: 9611.64285714
If we subtract 168 from 180, we get 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

The final outcome is 9611.64285714, with a leftover of 1.2e-08.