903129 divided by 42 
Let's see how many times 42 fits into 903129.

On to step 1:
When dividing 9 by 42, we get 0 with a remainder of 9.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 9, we end up with 9.
Take the next digit (0) from the dividend and append it to 9, then repeat: 90 / 42

Let's proceed to step 2:
42 can be fit into 90 2 times, resulting in a remainder of 6.
Write down 2 as next digit of the result. 
Result so far: 2.0
Deduct 84 from 90 and we're left with 6.
Bring next digit (3) of the dividend behind the 6 and repeat the process: 63 / 42

On to step 3:
42 goes into 63 1 times with a remainder of 21.
The next digit of our result is 1. 
Result so far: 21.0
If we subtract 42 from 63, we get 21.
Include the next digit (1) from the dividend after 21, then repeat: 211 / 42

Let's proceed to step 4:
42 goes into 211 5 times with a remainder of 1.
Use 5 as the next digit of our solution. 
Result so far: 215.0
Subtract 210 from 211 to get 1.
Fetch the next digit (2) from the dividend, attach it to 1 and continue: 12 / 42

Step 5:
If we divide 12 by 42, we get 0 and a remainder of 12.
Write down 0 as next digit of the result. 
Result so far: 2150.0
The remainder is 12 after subtracting 0 from 12.
Take the next digit (9) from the dividend and append it to 12, then repeat: 129 / 42

Moving on to step 6:
When dividing 129 by 42, we get 3 with a remainder of 3.
The next digit of our result is 3. 
Result so far: 21503.0
Deduct 126 from 129 and we're left with 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Advancing to step 7:
The number 42 fits into 30 0 times, leaving a remainder of 30.
Put 0 as the next digit of the answer. 
Result so far: 21503.0
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.

On to step 8:
300 divided by 42 is 7 with a remainder of 6.
The next digit of our result is 7. 
Result so far: 21503.07
Subtract 294 from 300 to get 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Advancing to step 9:
The number 42 fits into 60 1 times, leaving a remainder of 18.
The number 1 becomes the next digit in our result. 
Result so far: 21503.071
Deduct 42 from 60 and we're left 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.

Going ahead to step 10:
42 can be fit into 180 4 times, resulting in a remainder of 12.
The next digit of our result is 4. 
Result so far: 21503.0714
Subtracting 168 from 180 leaves us with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

On to step 11:
42 goes into 120 2 times with a remainder of 36.
The number 2 becomes the next digit in our result. 
Result so far: 21503.07142
Deduct 84 from 120 and we're left 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.

Going ahead to step 12:
42 goes into 360 8 times with a remainder of 24.
Write down 8 as next digit of the result. 
Result so far: 21503.071428
Subtract 336 from 360 to get 24.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

Moving on to step 13:
When dividing 240 by 42, we get 5 with a remainder of 30.
Use 5 as the next digit of our solution. 
Result so far: 21503.0714285
Subtracting 210 from 240 leaves us 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.

Step 14:
42 can be fit into 300 7 times, resulting in a remainder of 6.
Put 7 as the next digit of the answer. 
Result so far: 21503.07142857
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.

The final outcome is 21503.07142857, with a leftover of 6e-09.