We're dividing 305910 by 15 
We want to figure out the number of times 305910 can be divided by 15.

On to step 1:
If we divide 3 by 15, we get 0 and a remainder of 3.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 3, we end up with 3.
Grab the next digit (0) from the dividend, add it to 3, then carry on: 30 / 15

Going ahead to step 2:
The number 15 fits into 30 2 times, leaving a remainder of 0.
Put 2 as the next digit of the answer. 
Result so far: 2.0
Subtract 30 from 30 to get 0.
Take the next digit (5) from the dividend and append it to 0, then repeat: 5 / 15

On to step 3:
15 can be fit into 5 0 times, resulting in a remainder of 5.
Write down 0 as next digit of the result. 
Result so far: 20.0
Subtract 0 from 5 to get 5.
Fetch the next digit (9) from the dividend, attach it to 5 and continue: 59 / 15

Let's proceed to step 4:
When dividing 59 by 15, we get 3 with a remainder of 14.
Put 3 as the next digit of the answer. 
Result so far: 203.0
The remainder is 14 after subtracting 45 from 59.
Append the next digit (1) from the dividend to 14 and continue with: 141 / 15

Let's proceed to step 5:
15 can be fit into 141 9 times, resulting in a remainder of 6.
Use 9 as the next digit of our solution. 
Result so far: 2039.0
The remainder is 6 after subtracting 135 from 141.
Fetch the next digit (0) from the dividend, attach it to 6 and continue: 60 / 15

Going ahead to step 6:
15 can be fit into 60 4 times, resulting in a remainder of 0.
Record the quotient 4 as the next digit in the result. 
Result so far: 20394.0
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.

Moving on to step 7:
When dividing 0 by 15, we get 0 with a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 20394.0
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 8:
The number 15 fits into 0 0 times, leaving a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 20394.0
If we take 0 away from 0, 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.

Our division results in 20394.0 with a remaining 0.0.