121356 ÷ 30 
Let's see how many times 30 fits into 121356.

Moving on to step 1:
30 can be fit into 1 0 times, resulting in a remainder of 1.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 1 leaves us with 1.
Grab the next digit (2) from the dividend, add it to 1, then carry on: 12 / 30

Moving on to step 2:
12 divided by 30 is 0 with a remainder of 12.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 12 and we're left with 12.
Take the next digit (1) from the dividend and append it to 12, then repeat: 121 / 30

Going ahead to step 3:
30 goes into 121 4 times with a remainder of 1.
Record the quotient 4 as the next digit in the result. 
Result so far: 4.0
The remainder is 1 after subtracting 120 from 121.
Take the next digit (3) from the dividend and append it to 1, then repeat: 13 / 30

Step 4:
30 can be fit into 13 0 times, resulting in a remainder of 13.
The number 0 becomes the next digit in our result. 
Result so far: 40.0
If we take 0 away from 13, we end up with 13.
Take the next digit (5) from the dividend and append it to 13, then repeat: 135 / 30

Step 5:
30 can be fit into 135 4 times, resulting in a remainder of 15.
The next digit of our result is 4. 
Result so far: 404.0
Deduct 120 from 135 and we're left with 15.
Fetch the next digit (6) from the dividend, attach it to 15 and continue: 156 / 30

Going ahead to step 6:
30 can be fit into 156 5 times, resulting in a remainder of 6.
The next digit of our result is 5. 
Result so far: 4045.0
Subtract 150 from 156 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.

Going ahead to step 7:
60 divided by 30 is 2 with a remainder of 0.
The next digit of our result is 2. 
Result so far: 4045.2
Subtract 60 from 60 to get 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 8:
0 divided by 30 is 0 with a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 4045.2
If we subtract 0 from 0, we get 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:
The number 30 fits into 0 0 times, leaving a remainder of 0.
The next digit of our result is 0. 
Result so far: 4045.2
If we subtract 0 from 0, we get 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 quotient of the division is 4045.2, and the remainder is 0.0.