Let's divide 721664 by 86
Let's see how many times 86 fits into 721664.

Step 1:
The number 86 fits into 7 0 times, leaving a remainder of 7.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 7 and we're left with 7.
Append the next digit (2) from the dividend to 7 and continue with: 72 / 86

Let's proceed to step 2:
The number 86 fits into 72 0 times, leaving a remainder of 72.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 72 and we're left with 72.
Grab the next digit (1) from the dividend, add it to 72, then carry on: 721 / 86

On to step 3:
86 can be fit into 721 8 times, resulting in a remainder of 33.
Put 8 as the next digit of the answer. 
Result so far: 8.0
If we subtract 688 from 721, we get 33.
Append the next digit (6) from the dividend to 33 and continue with: 336 / 86

On to step 4:
If we divide 336 by 86, we get 3 and a remainder of 78.
The next digit of our result is 3. 
Result so far: 83.0
Subtracting 258 from 336 leaves us with 78.
Append the next digit (6) from the dividend to 78 and continue with: 786 / 86

On to step 5:
86 goes into 786 9 times with a remainder of 12.
Record the quotient 9 as the next digit in the result. 
Result so far: 839.0
Subtract 774 from 786 to get 12.
Fetch the next digit (4) from the dividend, attach it to 12 and continue: 124 / 86

Advancing to step 6:
The number 86 fits into 124 1 times, leaving a remainder of 38.
Record the quotient 1 as the next digit in the result. 
Result so far: 8391.0
Subtract 86 from 124 to 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.

Let's proceed to step 7:
The number 86 fits into 380 4 times, leaving a remainder of 36.
The next digit of our result is 4. 
Result so far: 8391.4
Deduct 344 from 380 and we're left with 36.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

Step 8:
The number 86 fits into 360 4 times, leaving a remainder of 16.
Record the quotient 4 as the next digit in the result. 
Result so far: 8391.44
Deduct 344 from 360 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.

The final result is 8391.44 with a remainder of 0.016.