315216 ÷ 81 
Let's see how many times 81 fits into 315216.

Step 1:
The number 81 fits into 3 0 times, leaving 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.
Take the next digit (1) from the dividend and append it to 3, then repeat: 31 / 81

On to step 2:
31 divided by 81 is 0 with a remainder of 31.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 31 to get 31.
Append the next digit (5) from the dividend to 31 and continue with: 315 / 81

Moving on to step 3:
The number 81 fits into 315 3 times, leaving a remainder of 72.
Use 3 as the next digit of our solution. 
Result so far: 3.0
If we subtract 243 from 315, we get 72.
Grab the next digit (2) from the dividend, add it to 72, then carry on: 722 / 81

Advancing to step 4:
81 goes into 722 8 times with a remainder of 74.
The next digit of our result is 8. 
Result so far: 38.0
If we subtract 648 from 722, we get 74.
Include the next digit (1) from the dividend after 74, then repeat: 741 / 81

On to step 5:
81 can be fit into 741 9 times, resulting in a remainder of 12.
The next digit of our result is 9. 
Result so far: 389.0
Subtract 729 from 741 to get 12.
Include the next digit (6) from the dividend after 12, then repeat: 126 / 81

Advancing to step 6:
81 can be fit into 126 1 times, resulting in a remainder of 45.
Write down 1 as next digit of the result. 
Result so far: 3891.0
Subtracting 81 from 126 leaves us with 45.
Since there are no more digits in the dividend, we add a zero to the remainder making it 450, and continue the process.

Step 7:
If we divide 450 by 81, we get 5 and a remainder of 45.
Record the quotient 5 as the next digit in the result. 
Result so far: 3891.5
Subtracting 405 from 450 leaves us with 45.
Since there are no more digits in the dividend, we add a zero to the remainder making it 450, and continue the process.

Going ahead to step 8:
81 goes into 450 5 times with a remainder of 45.
Write down 5 as next digit of the result. 
Result so far: 3891.55
Deduct 405 from 450 and we're left with 45.
Since there are no more digits in the dividend, we add a zero to the remainder making it 450, and continue the process.

The quotient of the division is 3891.55, and the remainder is 0.045.