Let's divide 123866 by 81
We want to figure out the number of times 123866 can be divided by 81.

Step 1:
The number 81 fits into 1 0 times, leaving a remainder of 1.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 1, we get 1.
Take the next digit (2) from the dividend and append it to 1, then repeat: 12 / 81

On to step 2:
81 can be fit into 12 0 times, resulting in a remainder of 12.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 12 to get 12.
Include the next digit (3) from the dividend after 12, then repeat: 123 / 81

Let's proceed to step 3:
When dividing 123 by 81, we get 1 with a remainder of 42.
The next digit of our result is 1. 
Result so far: 1.0
Subtracting 81 from 123 leaves us with 42.
Take the next digit (8) from the dividend and append it to 42, then repeat: 428 / 81

Going ahead to step 4:
The number 81 fits into 428 5 times, leaving a remainder of 23.
The next digit of our result is 5. 
Result so far: 15.0
Subtracting 405 from 428 leaves us with 23.
Take the next digit (6) from the dividend and append it to 23, then repeat: 236 / 81

Step 5:
236 divided by 81 is 2 with a remainder of 74.
Put 2 as the next digit of the answer. 
Result so far: 152.0
Subtract 162 from 236 to get 74.
Grab the next digit (6) from the dividend, add it to 74, then carry on: 746 / 81

Let's proceed to step 6:
81 can be fit into 746 9 times, resulting in a remainder of 17.
Use 9 as the next digit of our solution. 
Result so far: 1529.0
If we take 729 away from 746, we end up with 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

Advancing to step 7:
When dividing 170 by 81, we get 2 with a remainder of 8.
The number 2 becomes the next digit in our result. 
Result so far: 1529.2
If we take 162 away from 170, we end up with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Advancing to step 8:
81 can be fit into 80 0 times, resulting in a remainder of 80.
Put 0 as the next digit of the answer. 
Result so far: 1529.2
Deduct 0 from 80 and we're left with 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

Advancing to step 9:
800 divided by 81 is 9 with a remainder of 71.
The number 9 becomes the next digit in our result. 
Result so far: 1529.209
If we take 729 away from 800, we end up with 71.
Since there are no more digits in the dividend, we add a zero to the remainder making it 710, and continue the process.

Let's proceed to step 10:
The number 81 fits into 710 8 times, leaving a remainder of 62.
Use 8 as the next digit of our solution. 
Result so far: 1529.2098
The remainder is 62 after subtracting 648 from 710.
Since there are no more digits in the dividend, we add a zero to the remainder making it 620, and continue the process.

Moving on to step 11:
81 can be fit into 620 7 times, resulting in a remainder of 53.
Put 7 as the next digit of the answer. 
Result so far: 1529.20987
Subtracting 567 from 620 leaves us with 53.
Since there are no more digits in the dividend, we add a zero to the remainder making it 530, and continue the process.

Moving on to step 12:
81 goes into 530 6 times with a remainder of 44.
Put 6 as the next digit of the answer. 
Result so far: 1529.209876
Subtract 486 from 530 to get 44.
Since there are no more digits in the dividend, we add a zero to the remainder making it 440, and continue the process.

Moving on to step 13:
The number 81 fits into 440 5 times, leaving a remainder of 35.
Write down 5 as next digit of the result. 
Result so far: 1529.2098765
The remainder is 35 after subtracting 405 from 440.
Since there are no more digits in the dividend, we add a zero to the remainder making it 350, and continue the process.

Let's proceed to step 14:
81 can be fit into 350 4 times, resulting in a remainder of 26.
The next digit of our result is 4. 
Result so far: 1529.20987654
The remainder is 26 after subtracting 324 from 350.
Since there are no more digits in the dividend, we add a zero to the remainder making it 260, and continue the process.

After the division, we end up with 1529.20987654 and a remainder of 2.6e-08.