430990 divided by 42 
We want to figure out the number of times 430990 can be divided by 42.

Moving on to step 1:
42 can be fit into 4 0 times, resulting in a remainder of 4.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 4 after subtracting 0 from 4.
Take the next digit (3) from the dividend and append it to 4, then repeat: 43 / 42

On to step 2:
42 can be fit into 43 1 times, resulting in a remainder of 1.
Write down 1 as next digit of the result. 
Result so far: 1.0
If we take 42 away from 43, we end up with 1.
Fetch the next digit (0) from the dividend, attach it to 1 and continue: 10 / 42

On to step 3:
10 divided by 42 is 0 with a remainder of 10.
Put 0 as the next digit of the answer. 
Result so far: 10.0
If we take 0 away from 10, we end up with 10.
Fetch the next digit (9) from the dividend, attach it to 10 and continue: 109 / 42

On to step 4:
42 can be fit into 109 2 times, resulting in a remainder of 25.
Put 2 as the next digit of the answer. 
Result so far: 102.0
The remainder is 25 after subtracting 84 from 109.
Append the next digit (9) from the dividend to 25 and continue with: 259 / 42

Going ahead to step 5:
If we divide 259 by 42, we get 6 and a remainder of 7.
Put 6 as the next digit of the answer. 
Result so far: 1026.0
Deduct 252 from 259 and we're left with 7.
Include the next digit (0) from the dividend after 7, then repeat: 70 / 42

Let's proceed to step 6:
If we divide 70 by 42, we get 1 and a remainder of 28.
The number 1 becomes the next digit in our result. 
Result so far: 10261.0
The remainder is 28 after subtracting 42 from 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

Step 7:
When dividing 280 by 42, we get 6 with a remainder of 28.
Write down 6 as next digit of the result. 
Result so far: 10261.6
The remainder is 28 after subtracting 252 from 280.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

Let's proceed to step 8:
The number 42 fits into 280 6 times, leaving a remainder of 28.
Use 6 as the next digit of our solution. 
Result so far: 10261.66
The remainder is 28 after subtracting 252 from 280.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

The final outcome is 10261.66, with a leftover of 0.028.