We look at the division of 121959 by 30 
We're looking to find how many times 30 goes into 121959.

Let's proceed to step 1:
The number 30 fits into 1 0 times, leaving a remainder of 1.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 1 to get 1.
Grab the next digit (2) from the dividend, add it to 1, then carry on: 12 / 30

Let's proceed to step 2:
12 divided by 30 is 0 with a remainder of 12.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 12, we end up with 12.
Include the next digit (1) from the dividend after 12, then repeat: 121 / 30

Advancing to step 3:
If we divide 121 by 30, we get 4 and a remainder of 1.
Use 4 as the next digit of our solution. 
Result so far: 4.0
If we take 120 away from 121, we end up with 1.
Bring next digit (9) of the dividend behind the 1 and repeat the process: 19 / 30

Moving on to step 4:
When dividing 19 by 30, we get 0 with a remainder of 19.
Record the quotient 0 as the next digit in the result. 
Result so far: 40.0
Subtract 0 from 19 to get 19.
Fetch the next digit (5) from the dividend, attach it to 19 and continue: 195 / 30

Step 5:
When dividing 195 by 30, we get 6 with a remainder of 15.
Use 6 as the next digit of our solution. 
Result so far: 406.0
Subtract 180 from 195 to get 15.
Fetch the next digit (9) from the dividend, attach it to 15 and continue: 159 / 30

Moving on to step 6:
30 goes into 159 5 times with a remainder of 9.
The next digit of our result is 5. 
Result so far: 4065.0
The remainder is 9 after subtracting 150 from 159.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Advancing to step 7:
90 divided by 30 is 3 with a remainder of 0.
Write down 3 as next digit of the result. 
Result so far: 4065.3
If we take 90 away from 90, 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.

Going ahead to step 8:
30 goes into 0 0 times with a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 4065.3
Subtracting 0 from 0 leaves us 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.

Step 9:
30 goes into 0 0 times with a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 4065.3
Deduct 0 from 0 and we're left 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.

The final outcome is 4065.3, with a leftover of 0.0.