We're dividing 390670 by 81 
We want to figure out the number of times 390670 can be divided by 81.

Moving on to step 1:
81 can be fit into 3 0 times, resulting in a remainder of 3.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 3 to get 3.
Append the next digit (9) from the dividend to 3 and continue with: 39 / 81

Let's proceed to step 2:
81 goes into 39 0 times with a remainder of 39.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 39 and we're left with 39.
Bring next digit (0) of the dividend behind the 39 and repeat the process: 390 / 81

Going ahead to step 3:
81 goes into 390 4 times with a remainder of 66.
Put 4 as the next digit of the answer. 
Result so far: 4.0
Deduct 324 from 390 and we're left with 66.
Fetch the next digit (6) from the dividend, attach it to 66 and continue: 666 / 81

Going ahead to step 4:
81 can be fit into 666 8 times, resulting in a remainder of 18.
Write down 8 as next digit of the result. 
Result so far: 48.0
If we take 648 away from 666, we end up with 18.
Append the next digit (7) from the dividend to 18 and continue with: 187 / 81

Moving on to step 5:
81 can be fit into 187 2 times, resulting in a remainder of 25.
The next digit of our result is 2. 
Result so far: 482.0
The remainder is 25 after subtracting 162 from 187.
Fetch the next digit (0) from the dividend, attach it to 25 and continue: 250 / 81

Moving on to step 6:
81 goes into 250 3 times with a remainder of 7.
Record the quotient 3 as the next digit in the result. 
Result so far: 4823.0
Subtract 243 from 250 to get 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

Advancing to step 7:
When dividing 70 by 81, we get 0 with a remainder of 70.
Use 0 as the next digit of our solution. 
Result so far: 4823.0
If we take 0 away from 70, we end up 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.

Let's proceed to step 8:
700 divided by 81 is 8 with a remainder of 52.
Use 8 as the next digit of our solution. 
Result so far: 4823.08
Subtract 648 from 700 to get 52.
Since there are no more digits in the dividend, we add a zero to the remainder making it 520, and continue the process.

Advancing to step 9:
81 can be fit into 520 6 times, resulting in a remainder of 34.
The number 6 becomes the next digit in our result. 
Result so far: 4823.086
The remainder is 34 after subtracting 486 from 520.
Since there are no more digits in the dividend, we add a zero to the remainder making it 340, and continue the process.

Moving on to step 10:
81 can be fit into 340 4 times, resulting in a remainder of 16.
Put 4 as the next digit of the answer. 
Result so far: 4823.0864
Deduct 324 from 340 and we're left 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 11:
160 divided by 81 is 1 with a remainder of 79.
Write down 1 as next digit of the result. 
Result so far: 4823.08641
If we take 81 away from 160, we end up 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.

Let's proceed to step 12:
81 goes into 790 9 times with a remainder of 61.
Put 9 as the next digit of the answer. 
Result so far: 4823.086419
Subtract 729 from 790 to 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.

Moving on to step 13:
If we divide 610 by 81, we get 7 and a remainder of 43.
Write down 7 as next digit of the result. 
Result so far: 4823.0864197
Subtracting 567 from 610 leaves us with 43.
Since there are no more digits in the dividend, we add a zero to the remainder making it 430, and continue the process.

Advancing to step 14:
If we divide 430 by 81, we get 5 and a remainder of 25.
Write down 5 as next digit of the result. 
Result so far: 4823.08641975
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.

The final result is 4823.08641975 with a remainder of 2.5e-08.