We're dividing 312902 by 25 
We want to figure out the number of times 312902 can be divided by 25.

Advancing to step 1:
25 goes into 3 0 times with a remainder of 3.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 3 leaves us with 3.
Append the next digit (1) from the dividend to 3 and continue with: 31 / 25

Advancing to step 2:
The number 25 fits into 31 1 times, leaving a remainder of 6.
Write down 1 as next digit of the result. 
Result so far: 1.0
Deduct 25 from 31 and we're left with 6.
Take the next digit (2) from the dividend and append it to 6, then repeat: 62 / 25

Let's proceed to step 3:
The number 25 fits into 62 2 times, leaving a remainder of 12.
Use 2 as the next digit of our solution. 
Result so far: 12.0
Subtract 50 from 62 to get 12.
Append the next digit (9) from the dividend to 12 and continue with: 129 / 25

On to step 4:
25 goes into 129 5 times with a remainder of 4.
Record the quotient 5 as the next digit in the result. 
Result so far: 125.0
The remainder is 4 after subtracting 125 from 129.
Append the next digit (0) from the dividend to 4 and continue with: 40 / 25

Step 5:
The number 25 fits into 40 1 times, leaving a remainder of 15.
The next digit of our result is 1. 
Result so far: 1251.0
If we subtract 25 from 40, we get 15.
Bring next digit (2) of the dividend behind the 15 and repeat the process: 152 / 25

Let's proceed to step 6:
If we divide 152 by 25, we get 6 and a remainder of 2.
The number 6 becomes the next digit in our result. 
Result so far: 12516.0
The remainder is 2 after subtracting 150 from 152.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Let's proceed to step 7:
The number 25 fits into 20 0 times, leaving a remainder of 20.
Use 0 as the next digit of our solution. 
Result so far: 12516.0
Subtract 0 from 20 to get 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Advancing to step 8:
The number 25 fits into 200 8 times, leaving a remainder of 0.
Use 8 as the next digit of our solution. 
Result so far: 12516.08
The remainder is 0 after subtracting 200 from 200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Advancing to step 9:
If we divide 0 by 25, we get 0 and a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 12516.08
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.

On to step 10:
The number 25 fits into 0 0 times, leaving a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 12516.08
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.

The quotient of the division is 12516.08, and the remainder is 0.0.