387721 ÷ 30 
We want to divide 387721 by 30.

Let's proceed to step 1:
3 divided by 30 is 0 with a remainder of 3.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 3 after subtracting 0 from 3.
Bring next digit (8) of the dividend behind the 3 and repeat the process: 38 / 30

On to step 2:
If we divide 38 by 30, we get 1 and a remainder of 8.
Put 1 as the next digit of the answer. 
Result so far: 1.0
Deduct 30 from 38 and we're left with 8.
Include the next digit (7) from the dividend after 8, then repeat: 87 / 30

Step 3:
When dividing 87 by 30, we get 2 with a remainder of 27.
The next digit of our result is 2. 
Result so far: 12.0
The remainder is 27 after subtracting 60 from 87.
Bring next digit (7) of the dividend behind the 27 and repeat the process: 277 / 30

Advancing to step 4:
277 divided by 30 is 9 with a remainder of 7.
The number 9 becomes the next digit in our result. 
Result so far: 129.0
The remainder is 7 after subtracting 270 from 277.
Bring next digit (2) of the dividend behind the 7 and repeat the process: 72 / 30

Step 5:
The number 30 fits into 72 2 times, leaving a remainder of 12.
Use 2 as the next digit of our solution. 
Result so far: 1292.0
The remainder is 12 after subtracting 60 from 72.
Append the next digit (1) from the dividend to 12 and continue with: 121 / 30

On to step 6:
When dividing 121 by 30, we get 4 with a remainder of 1.
Use 4 as the next digit of our solution. 
Result so far: 12924.0
Subtract 120 from 121 to get 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Going ahead to step 7:
The number 30 fits into 10 0 times, leaving a remainder of 10.
Record the quotient 0 as the next digit in the result. 
Result so far: 12924.0
If we take 0 away from 10, we end up with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Step 8:
If we divide 100 by 30, we get 3 and a remainder of 10.
Write down 3 as next digit of the result. 
Result so far: 12924.03
If we subtract 90 from 100, we get 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

On to step 9:
When dividing 100 by 30, we get 3 with a remainder of 10.
Write down 3 as next digit of the result. 
Result so far: 12924.033
Subtract 90 from 100 to get 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

The final outcome is 12924.033, with a leftover of 0.001.