315259 ÷ 20 
Our goal is to divide 315259 by 20.

Step 1:
The number 20 fits into 3 0 times, leaving a remainder of 3.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 3 after subtracting 0 from 3.
Include the next digit (1) from the dividend after 3, then repeat: 31 / 20

Advancing to step 2:
20 can be fit into 31 1 times, resulting in a remainder of 11.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
Deduct 20 from 31 and we're left with 11.
Take the next digit (5) from the dividend and append it to 11, then repeat: 115 / 20

Step 3:
When dividing 115 by 20, we get 5 with a remainder of 15.
Use 5 as the next digit of our solution. 
Result so far: 15.0
The remainder is 15 after subtracting 100 from 115.
Bring next digit (2) of the dividend behind the 15 and repeat the process: 152 / 20

Advancing to step 4:
20 can be fit into 152 7 times, resulting in a remainder of 12.
Record the quotient 7 as the next digit in the result. 
Result so far: 157.0
The remainder is 12 after subtracting 140 from 152.
Fetch the next digit (5) from the dividend, attach it to 12 and continue: 125 / 20

Moving on to step 5:
When dividing 125 by 20, we get 6 with a remainder of 5.
Record the quotient 6 as the next digit in the result. 
Result so far: 1576.0
Deduct 120 from 125 and we're left with 5.
Include the next digit (9) from the dividend after 5, then repeat: 59 / 20

Step 6:
59 divided by 20 is 2 with a remainder of 19.
Put 2 as the next digit of the answer. 
Result so far: 15762.0
Subtract 40 from 59 to get 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

Moving on to step 7:
When dividing 190 by 20, we get 9 with a remainder of 10.
Write down 9 as next digit of the result. 
Result so far: 15762.9
If we take 180 away from 190, 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.

Advancing to step 8:
20 goes into 100 5 times with a remainder of 0.
Put 5 as the next digit of the answer. 
Result so far: 15762.95
If we subtract 100 from 100, 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.

Moving on to step 9:
20 goes into 0 0 times with a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 15762.95
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.

Moving on to step 10:
The number 20 fits into 0 0 times, leaving a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 15762.95
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 result is 15762.95 with a remainder of 0.0.