We're dividing 687318 by 21 
We want to figure out the number of times 687318 can be divided by 21.

Let's proceed to step 1:
The number 21 fits into 6 0 times, leaving a remainder of 6.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 6 to get 6.
Grab the next digit (8) from the dividend, add it to 6, then carry on: 68 / 21

Let's proceed to step 2:
21 can be fit into 68 3 times, resulting in a remainder of 5.
Write down 3 as next digit of the result. 
Result so far: 3.0
Subtracting 63 from 68 leaves us with 5.
Bring next digit (7) of the dividend behind the 5 and repeat the process: 57 / 21

Going ahead to step 3:
When dividing 57 by 21, we get 2 with a remainder of 15.
The number 2 becomes the next digit in our result. 
Result so far: 32.0
Subtract 42 from 57 to get 15.
Include the next digit (3) from the dividend after 15, then repeat: 153 / 21

Going ahead to step 4:
The number 21 fits into 153 7 times, leaving a remainder of 6.
Write down 7 as next digit of the result. 
Result so far: 327.0
Subtracting 147 from 153 leaves us with 6.
Bring next digit (1) of the dividend behind the 6 and repeat the process: 61 / 21

Step 5:
61 divided by 21 is 2 with a remainder of 19.
The next digit of our result is 2. 
Result so far: 3272.0
The remainder is 19 after subtracting 42 from 61.
Grab the next digit (8) from the dividend, add it to 19, then carry on: 198 / 21

Step 6:
When dividing 198 by 21, we get 9 with a remainder of 9.
Use 9 as the next digit of our solution. 
Result so far: 32729.0
Subtracting 189 from 198 leaves us with 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Moving on to step 7:
21 can be fit into 90 4 times, resulting in a remainder of 6.
Put 4 as the next digit of the answer. 
Result so far: 32729.4
The remainder is 6 after subtracting 84 from 90.
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 8:
If we divide 60 by 21, we get 2 and a remainder of 18.
Write down 2 as next digit of the result. 
Result so far: 32729.42
If we subtract 42 from 60, we get 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

On to step 9:
The number 21 fits into 180 8 times, leaving a remainder of 12.
The number 8 becomes the next digit in our result. 
Result so far: 32729.428
Subtracting 168 from 180 leaves us 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.

On to step 10:
120 divided by 21 is 5 with a remainder of 15.
The next digit of our result is 5. 
Result so far: 32729.4285
Deduct 105 from 120 and we're left with 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Advancing to step 11:
21 goes into 150 7 times with a remainder of 3.
Write down 7 as next digit of the result. 
Result so far: 32729.42857
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 12:
When dividing 30 by 21, we get 1 with a remainder of 9.
Put 1 as the next digit of the answer. 
Result so far: 32729.428571
Deduct 21 from 30 and we're left with 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 13:
When dividing 90 by 21, we get 4 with a remainder of 6.
Use 4 as the next digit of our solution. 
Result so far: 32729.4285714
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.

Let's proceed to step 14:
The number 21 fits into 60 2 times, leaving a remainder of 18.
Put 2 as the next digit of the answer. 
Result so far: 32729.42857142
Subtract 42 from 60 to get 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Our division results in 32729.42857142 with a remaining 1.8e-08.