We look at the division of 670663 by 86 
Let's see how many times 86 fits into 670663.

On to step 1:
86 can be fit into 6 0 times, resulting in a remainder of 6.
The next digit of our result is 0. 
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 / 86

Advancing to step 2:
The number 86 fits into 67 0 times, leaving a remainder of 67.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 67 leaves us with 67.
Bring next digit (0) of the dividend behind the 67 and repeat the process: 670 / 86

Going ahead to step 3:
The number 86 fits into 670 7 times, leaving a remainder of 68.
The next digit of our result is 7. 
Result so far: 7.0
The remainder is 68 after subtracting 602 from 670.
Bring next digit (6) of the dividend behind the 68 and repeat the process: 686 / 86

On to step 4:
86 can be fit into 686 7 times, resulting in a remainder of 84.
Put 7 as the next digit of the answer. 
Result so far: 77.0
The remainder is 84 after subtracting 602 from 686.
Take the next digit (6) from the dividend and append it to 84, then repeat: 846 / 86

Moving on to step 5:
86 goes into 846 9 times with a remainder of 72.
The number 9 becomes the next digit in our result. 
Result so far: 779.0
Subtracting 774 from 846 leaves us with 72.
Include the next digit (3) from the dividend after 72, then repeat: 723 / 86

Advancing to step 6:
723 divided by 86 is 8 with a remainder of 35.
The number 8 becomes the next digit in our result. 
Result so far: 7798.0
Deduct 688 from 723 and we're left with 35.
Since there are no more digits in the dividend, we add a zero to the remainder making it 350, and continue the process.

Advancing to step 7:
350 divided by 86 is 4 with a remainder of 6.
Write down 4 as next digit of the result. 
Result so far: 7798.4
Subtracting 344 from 350 leaves us with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Moving on to step 8:
60 divided by 86 is 0 with a remainder of 60.
The next digit of our result is 0. 
Result so far: 7798.4
Subtract 0 from 60 to get 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Step 9:
86 can be fit into 600 6 times, resulting in a remainder of 84.
Use 6 as the next digit of our solution. 
Result so far: 7798.406
Deduct 516 from 600 and we're left with 84.
Since there are no more digits in the dividend, we add a zero to the remainder making it 840, and continue the process.

On to step 10:
The number 86 fits into 840 9 times, leaving a remainder of 66.
Record the quotient 9 as the next digit in the result. 
Result so far: 7798.4069
If we subtract 774 from 840, we get 66.
Since there are no more digits in the dividend, we add a zero to the remainder making it 660, and continue the process.

Step 11:
660 divided by 86 is 7 with a remainder of 58.
Put 7 as the next digit of the answer. 
Result so far: 7798.40697
If we take 602 away from 660, we end up with 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 12:
When dividing 580 by 86, we get 6 with a remainder of 64.
Put 6 as the next digit of the answer. 
Result so far: 7798.406976
Deduct 516 from 580 and we're left with 64.
Since there are no more digits in the dividend, we add a zero to the remainder making it 640, and continue the process.

Moving on to step 13:
If we divide 640 by 86, we get 7 and a remainder of 38.
The next digit of our result is 7. 
Result so far: 7798.4069767
If we subtract 602 from 640, we get 38.
Since there are no more digits in the dividend, we add a zero to the remainder making it 380, and continue the process.

Going ahead to step 14:
If we divide 380 by 86, we get 4 and a remainder of 36.
Put 4 as the next digit of the answer. 
Result so far: 7798.40697674
If we subtract 344 from 380, we get 36.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

After the division, we end up with 7798.40697674 and a remainder of 3.6e-08.