We're dividing 678933 by 21 
We want to figure out the number of times 678933 can be divided by 21.

Step 1:
When dividing 6 by 21, we get 0 with a remainder of 6.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 6 and we're left with 6.
Bring next digit (7) of the dividend behind the 6 and repeat the process: 67 / 21

Step 2:
If we divide 67 by 21, we get 3 and a remainder of 4.
The number 3 becomes the next digit in our result. 
Result so far: 3.0
Subtract 63 from 67 to get 4.
Grab the next digit (8) from the dividend, add it to 4, then carry on: 48 / 21

On to step 3:
48 divided by 21 is 2 with a remainder of 6.
The next digit of our result is 2. 
Result so far: 32.0
If we take 42 away from 48, we end up with 6.
Include the next digit (9) from the dividend after 6, then repeat: 69 / 21

Advancing to step 4:
69 divided by 21 is 3 with a remainder of 6.
Put 3 as the next digit of the answer. 
Result so far: 323.0
If we subtract 63 from 69, we get 6.
Include the next digit (3) from the dividend after 6, then repeat: 63 / 21

On to step 5:
21 goes into 63 3 times with a remainder of 0.
Put 3 as the next digit of the answer. 
Result so far: 3233.0
Deduct 63 from 63 and we're left with 0.
Take the next digit (3) from the dividend and append it to 0, then repeat: 3 / 21

Let's proceed to step 6:
When dividing 3 by 21, we get 0 with a remainder of 3.
Write down 0 as next digit of the result. 
Result so far: 32330.0
Subtract 0 from 3 to get 3.
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 7:
When dividing 30 by 21, we get 1 with a remainder of 9.
Write down 1 as next digit of the result. 
Result so far: 32330.1
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 8:
21 goes into 90 4 times with a remainder of 6.
The next digit of our result is 4. 
Result so far: 32330.14
Deduct 84 from 90 and we're left 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 9:
If we divide 60 by 21, we get 2 and a remainder of 18.
Use 2 as the next digit of our solution. 
Result so far: 32330.142
The remainder is 18 after subtracting 42 from 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Moving on to step 10:
The number 21 fits into 180 8 times, leaving a remainder of 12.
Write down 8 as next digit of the result. 
Result so far: 32330.1428
Deduct 168 from 180 and we're left 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.

Advancing to step 11:
21 can be fit into 120 5 times, resulting in a remainder of 15.
The number 5 becomes the next digit in our result. 
Result so far: 32330.14285
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.

On to step 12:
If we divide 150 by 21, we get 7 and a remainder of 3.
The next digit of our result is 7. 
Result so far: 32330.142857
Subtract 147 from 150 to get 3.
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 13:
21 goes into 30 1 times with a remainder of 9.
Put 1 as the next digit of the answer. 
Result so far: 32330.1428571
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.

Moving on to step 14:
21 goes into 90 4 times with a remainder of 6.
The next digit of our result is 4. 
Result so far: 32330.14285714
Subtracting 84 from 90 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.

After the division, we end up with 32330.14285714 and a remainder of 6e-09.