12123012 ÷ 81 
Our goal is to divide 12123012 by 81.

Moving on to step 1:
When dividing 1 by 81, we get 0 with a remainder of 1.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 1 after subtracting 0 from 1.
Grab the next digit (2) from the dividend, add it to 1, then carry on: 12 / 81

On to step 2:
The number 81 fits into 12 0 times, leaving a remainder of 12.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 12 after subtracting 0 from 12.
Take the next digit (1) from the dividend and append it to 12, then repeat: 121 / 81

Let's proceed to step 3:
121 divided by 81 is 1 with a remainder of 40.
Put 1 as the next digit of the answer. 
Result so far: 1.0
Deduct 81 from 121 and we're left with 40.
Append the next digit (2) from the dividend to 40 and continue with: 402 / 81

Moving on to step 4:
When dividing 402 by 81, we get 4 with a remainder of 78.
The next digit of our result is 4. 
Result so far: 14.0
Deduct 324 from 402 and we're left with 78.
Grab the next digit (3) from the dividend, add it to 78, then carry on: 783 / 81

Moving on to step 5:
81 goes into 783 9 times with a remainder of 54.
Write down 9 as next digit of the result. 
Result so far: 149.0
If we subtract 729 from 783, we get 54.
Append the next digit (0) from the dividend to 54 and continue with: 540 / 81

Moving on to step 6:
540 divided by 81 is 6 with a remainder of 54.
Record the quotient 6 as the next digit in the result. 
Result so far: 1496.0
The remainder is 54 after subtracting 486 from 540.
Append the next digit (1) from the dividend to 54 and continue with: 541 / 81

Let's proceed to step 7:
When dividing 541 by 81, we get 6 with a remainder of 55.
Use 6 as the next digit of our solution. 
Result so far: 14966.0
Deduct 486 from 541 and we're left with 55.
Bring next digit (2) of the dividend behind the 55 and repeat the process: 552 / 81

Advancing to step 8:
552 divided by 81 is 6 with a remainder of 66.
The next digit of our result is 6. 
Result so far: 149666.0
If we take 486 away from 552, we end up with 66.
Since there are no more digits in the dividend, we add a zero to the remainder making it 660, and continue the process.

Let's proceed to step 9:
If we divide 660 by 81, we get 8 and a remainder of 12.
The number 8 becomes the next digit in our result. 
Result so far: 149666.8
If we subtract 648 from 660, we get 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Advancing to step 10:
When dividing 120 by 81, we get 1 with a remainder of 39.
Write down 1 as next digit of the result. 
Result so far: 149666.81
Subtract 81 from 120 to get 39.
Since there are no more digits in the dividend, we add a zero to the remainder making it 390, and continue the process.

Going ahead to step 11:
If we divide 390 by 81, we get 4 and a remainder of 66.
Use 4 as the next digit of our solution. 
Result so far: 149666.814
If we take 324 away from 390, we end up with 66.
Since there are no more digits in the dividend, we add a zero to the remainder making it 660, and continue the process.

Going ahead to step 12:
If we divide 660 by 81, we get 8 and a remainder of 12.
The next digit of our result is 8. 
Result so far: 149666.8148
Subtracting 648 from 660 leaves us with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Going ahead to step 13:
120 divided by 81 is 1 with a remainder of 39.
The next digit of our result is 1. 
Result so far: 149666.81481
If we subtract 81 from 120, we get 39.
Since there are no more digits in the dividend, we add a zero to the remainder making it 390, and continue the process.

On to step 14:
81 can be fit into 390 4 times, resulting in a remainder of 66.
Write down 4 as next digit of the result. 
Result so far: 149666.814814
Deduct 324 from 390 and we're left with 66.
Since there are no more digits in the dividend, we add a zero to the remainder making it 660, and continue the process.

Let's proceed to step 15:
81 can be fit into 660 8 times, resulting in a remainder of 12.
Put 8 as the next digit of the answer. 
Result so far: 149666.8148148
Deduct 648 from 660 and we're left with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Let's proceed to step 16:
When dividing 120 by 81, we get 1 with a remainder of 39.
Put 1 as the next digit of the answer. 
Result so far: 149666.81481481
Subtract 81 from 120 to get 39.
Since there are no more digits in the dividend, we add a zero to the remainder making it 390, and continue the process.

Our division results in 149666.81481481 with a remaining 3.9e-08.