645793 divided by 81 
We want to divide 645793 by 81.

Step 1:
81 goes into 6 0 times with a remainder of 6.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 6, we end up with 6.
Grab the next digit (4) from the dividend, add it to 6, then carry on: 64 / 81

Going ahead to step 2:
81 can be fit into 64 0 times, resulting in a remainder of 64.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 64 to get 64.
Take the next digit (5) from the dividend and append it to 64, then repeat: 645 / 81

Moving on to step 3:
If we divide 645 by 81, we get 7 and a remainder of 78.
Use 7 as the next digit of our solution. 
Result so far: 7.0
The remainder is 78 after subtracting 567 from 645.
Include the next digit (7) from the dividend after 78, then repeat: 787 / 81

On to step 4:
The number 81 fits into 787 9 times, leaving a remainder of 58.
Use 9 as the next digit of our solution. 
Result so far: 79.0
If we subtract 729 from 787, we get 58.
Include the next digit (9) from the dividend after 58, then repeat: 589 / 81

Moving on to step 5:
589 divided by 81 is 7 with a remainder of 22.
Put 7 as the next digit of the answer. 
Result so far: 797.0
Subtracting 567 from 589 leaves us with 22.
Include the next digit (3) from the dividend after 22, then repeat: 223 / 81

Let's proceed to step 6:
When dividing 223 by 81, we get 2 with a remainder of 61.
The next digit of our result is 2. 
Result so far: 7972.0
If we subtract 162 from 223, we get 61.
Since there are no more digits in the dividend, we add a zero to the remainder making it 610, and continue the process.

Advancing to step 7:
The number 81 fits into 610 7 times, leaving a remainder of 43.
Record the quotient 7 as the next digit in the result. 
Result so far: 7972.7
The remainder is 43 after subtracting 567 from 610.
Since there are no more digits in the dividend, we add a zero to the remainder making it 430, and continue the process.

Moving on to step 8:
When dividing 430 by 81, we get 5 with a remainder of 25.
Use 5 as the next digit of our solution. 
Result so far: 7972.75
The remainder is 25 after subtracting 405 from 430.
Since there are no more digits in the dividend, we add a zero to the remainder making it 250, and continue the process.

Moving on to step 9:
250 divided by 81 is 3 with a remainder of 7.
Use 3 as the next digit of our solution. 
Result so far: 7972.753
Deduct 243 from 250 and we're left with 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

Let's proceed to step 10:
81 goes into 70 0 times with a remainder of 70.
Put 0 as the next digit of the answer. 
Result so far: 7972.753
Subtracting 0 from 70 leaves us with 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 700, and continue the process.

Advancing to step 11:
81 can be fit into 700 8 times, resulting in a remainder of 52.
The next digit of our result is 8. 
Result so far: 7972.75308
If we take 648 away from 700, we end up with 52.
Since there are no more digits in the dividend, we add a zero to the remainder making it 520, and continue the process.

Let's proceed to step 12:
If we divide 520 by 81, we get 6 and a remainder of 34.
Use 6 as the next digit of our solution. 
Result so far: 7972.753086
Subtracting 486 from 520 leaves us with 34.
Since there are no more digits in the dividend, we add a zero to the remainder making it 340, and continue the process.

Let's proceed to step 13:
If we divide 340 by 81, we get 4 and a remainder of 16.
Put 4 as the next digit of the answer. 
Result so far: 7972.7530864
If we take 324 away from 340, we end up with 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Step 14:
When dividing 160 by 81, we get 1 with a remainder of 79.
Record the quotient 1 as the next digit in the result. 
Result so far: 7972.75308641
Subtracting 81 from 160 leaves us with 79.
Since there are no more digits in the dividend, we add a zero to the remainder making it 790, and continue the process.

In conclusion, the division gives 7972.75308641 with a balance of 7.9e-08.