We divide 670891 by 81
We want to figure out the number of times 670891 can be divided by 81.

Moving on to step 1:
When dividing 6 by 81, we get 0 with a remainder of 6.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 6 after subtracting 0 from 6.
Include the next digit (7) from the dividend after 6, then repeat: 67 / 81

On to step 2:
When dividing 67 by 81, we get 0 with a remainder of 67.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 67 and we're left with 67.
Grab the next digit (0) from the dividend, add it to 67, then carry on: 670 / 81

Step 3:
81 can be fit into 670 8 times, resulting in a remainder of 22.
Write down 8 as next digit of the result. 
Result so far: 8.0
Deduct 648 from 670 and we're left with 22.
Grab the next digit (8) from the dividend, add it to 22, then carry on: 228 / 81

Advancing to step 4:
228 divided by 81 is 2 with a remainder of 66.
Use 2 as the next digit of our solution. 
Result so far: 82.0
The remainder is 66 after subtracting 162 from 228.
Include the next digit (9) from the dividend after 66, then repeat: 669 / 81

On to step 5:
669 divided by 81 is 8 with a remainder of 21.
The next digit of our result is 8. 
Result so far: 828.0
Deduct 648 from 669 and we're left with 21.
Append the next digit (1) from the dividend to 21 and continue with: 211 / 81

Moving on to step 6:
81 goes into 211 2 times with a remainder of 49.
Put 2 as the next digit of the answer. 
Result so far: 8282.0
Subtract 162 from 211 to get 49.
Since there are no more digits in the dividend, we add a zero to the remainder making it 490, and continue the process.

On to step 7:
81 goes into 490 6 times with a remainder of 4.
Write down 6 as next digit of the result. 
Result so far: 8282.6
If we take 486 away from 490, we end up with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

On to step 8:
81 can be fit into 40 0 times, resulting in a remainder of 40.
The next digit of our result is 0. 
Result so far: 8282.6
If we take 0 away from 40, we end up with 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Step 9:
If we divide 400 by 81, we get 4 and a remainder of 76.
The number 4 becomes the next digit in our result. 
Result so far: 8282.604
Subtracting 324 from 400 leaves us with 76.
Since there are no more digits in the dividend, we add a zero to the remainder making it 760, and continue the process.

Let's proceed to step 10:
The number 81 fits into 760 9 times, leaving a remainder of 31.
The next digit of our result is 9. 
Result so far: 8282.6049
The remainder is 31 after subtracting 729 from 760.
Since there are no more digits in the dividend, we add a zero to the remainder making it 310, and continue the process.

On to step 11:
The number 81 fits into 310 3 times, leaving a remainder of 67.
The next digit of our result is 3. 
Result so far: 8282.60493
The remainder is 67 after subtracting 243 from 310.
Since there are no more digits in the dividend, we add a zero to the remainder making it 670, and continue the process.

Let's proceed to step 12:
670 divided by 81 is 8 with a remainder of 22.
Record the quotient 8 as the next digit in the result. 
Result so far: 8282.604938
The remainder is 22 after subtracting 648 from 670.
Since there are no more digits in the dividend, we add a zero to the remainder making it 220, and continue the process.

Let's proceed to step 13:
If we divide 220 by 81, we get 2 and a remainder of 58.
Use 2 as the next digit of our solution. 
Result so far: 8282.6049382
Subtract 162 from 220 to get 58.
Since there are no more digits in the dividend, we add a zero to the remainder making it 580, and continue the process.

Let's proceed to step 14:
81 can be fit into 580 7 times, resulting in a remainder of 13.
Use 7 as the next digit of our solution. 
Result so far: 8282.60493827
Subtracting 567 from 580 leaves us with 13.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

The final outcome is 8282.60493827, with a leftover of 1.3e-08.