64311 ÷ 21 
Let's see how many times 21 fits into 64311.

On to step 1:
The number 21 fits into 6 0 times, leaving a remainder of 6.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 6 to get 6.
Grab the next digit (4) from the dividend, add it to 6, then carry on: 64 / 21

Let's proceed to step 2:
When dividing 64 by 21, we get 3 with a remainder of 1.
The next digit of our result is 3. 
Result so far: 3.0
Subtract 63 from 64 to get 1.
Grab the next digit (3) from the dividend, add it to 1, then carry on: 13 / 21

Going ahead to step 3:
When dividing 13 by 21, we get 0 with a remainder of 13.
Put 0 as the next digit of the answer. 
Result so far: 30.0
Subtracting 0 from 13 leaves us with 13.
Grab the next digit (1) from the dividend, add it to 13, then carry on: 131 / 21

Step 4:
The number 21 fits into 131 6 times, leaving a remainder of 5.
Record the quotient 6 as the next digit in the result. 
Result so far: 306.0
If we subtract 126 from 131, we get 5.
Include the next digit (1) from the dividend after 5, then repeat: 51 / 21

On to step 5:
When dividing 51 by 21, we get 2 with a remainder of 9.
The number 2 becomes the next digit in our result. 
Result so far: 3062.0
Subtract 42 from 51 to get 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Let's proceed to step 6:
21 goes into 90 4 times with a remainder of 6.
Put 4 as the next digit of the answer. 
Result so far: 3062.4
If we take 84 away from 90, we end up 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.

Let's proceed to step 7:
If we divide 60 by 21, we get 2 and a remainder of 18.
The next digit of our result is 2. 
Result so far: 3062.42
Subtracting 42 from 60 leaves us with 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Going ahead to step 8:
21 can be fit into 180 8 times, resulting in a remainder of 12.
Record the quotient 8 as the next digit in the result. 
Result so far: 3062.428
If we take 168 away from 180, we end up with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Moving on to step 9:
The number 21 fits into 120 5 times, leaving a remainder of 15.
The next digit of our result is 5. 
Result so far: 3062.4285
If we subtract 105 from 120, we get 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Moving on to step 10:
If we divide 150 by 21, we get 7 and a remainder of 3.
The number 7 becomes the next digit in our result. 
Result so far: 3062.42857
The remainder is 3 after subtracting 147 from 150.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Advancing to step 11:
30 divided by 21 is 1 with a remainder of 9.
The number 1 becomes the next digit in our result. 
Result so far: 3062.428571
If we subtract 21 from 30, we get 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Advancing to step 12:
When dividing 90 by 21, we get 4 with a remainder of 6.
Record the quotient 4 as the next digit in the result. 
Result so far: 3062.4285714
Subtract 84 from 90 to get 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Advancing to step 13:
21 can be fit into 60 2 times, resulting in a remainder of 18.
The number 2 becomes the next digit in our result. 
Result so far: 3062.42857142
Subtracting 42 from 60 leaves us with 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

The final result is 3062.42857142 with a remainder of 1.8e-08.