We look at the division of 42120 by 930 
Let's see how many times 930 fits into 42120.

Moving on to step 1:
The number 930 fits into 4 0 times, leaving a remainder of 4.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 4 after subtracting 0 from 4.
Fetch the next digit (2) from the dividend, attach it to 4 and continue: 42 / 930

Step 2:
930 can be fit into 42 0 times, resulting in a remainder of 42.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 42 to get 42.
Grab the next digit (1) from the dividend, add it to 42, then carry on: 421 / 930

On to step 3:
930 can be fit into 421 0 times, resulting in a remainder of 421.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 421 after subtracting 0 from 421.
Bring next digit (2) of the dividend behind the 421 and repeat the process: 4212 / 930

Let's proceed to step 4:
930 goes into 4212 4 times with a remainder of 492.
Record the quotient 4 as the next digit in the result. 
Result so far: 4.0
Deduct 3720 from 4212 and we're left with 492.
Bring next digit (0) of the dividend behind the 492 and repeat the process: 4920 / 930

Moving on to step 5:
930 goes into 4920 5 times with a remainder of 270.
The next digit of our result is 5. 
Result so far: 45.0
Subtracting 4650 from 4920 leaves us with 270.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2700, and continue the process.

Advancing to step 6:
2700 divided by 930 is 2 with a remainder of 840.
Record the quotient 2 as the next digit in the result. 
Result so far: 45.2
If we take 1860 away from 2700, we end up with 840.
Since there are no more digits in the dividend, we add a zero to the remainder making it 8400, and continue the process.

Advancing to step 7:
If we divide 8400 by 930, we get 9 and a remainder of 30.
Put 9 as the next digit of the answer. 
Result so far: 45.29
Deduct 8370 from 8400 and we're left 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 8:
If we divide 300 by 930, we get 0 and a remainder of 300.
The number 0 becomes the next digit in our result. 
Result so far: 45.29
If we subtract 0 from 300, we get 300.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3000, and continue the process.

Moving on to step 9:
When dividing 3000 by 930, we get 3 with a remainder of 210.
The number 3 becomes the next digit in our result. 
Result so far: 45.2903
Subtracting 2790 from 3000 leaves us with 210.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2100, and continue the process.

On to step 10:
When dividing 2100 by 930, we get 2 with a remainder of 240.
Record the quotient 2 as the next digit in the result. 
Result so far: 45.29032
Subtract 1860 from 2100 to get 240.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2400, and continue the process.

On to step 11:
930 can be fit into 2400 2 times, resulting in a remainder of 540.
The next digit of our result is 2. 
Result so far: 45.290322
Deduct 1860 from 2400 and we're left with 540.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5400, and continue the process.

The final outcome is 45.290322, with a leftover of 5.4e-05.