We're dividing 336679 by 21 
Let's see how many times 21 fits into 336679.

On to step 1:
21 goes into 3 0 times with a remainder of 3.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 3 after subtracting 0 from 3.
Bring next digit (3) of the dividend behind the 3 and repeat the process: 33 / 21

Let's proceed to step 2:
21 can be fit into 33 1 times, resulting in a remainder of 12.
The next digit of our result is 1. 
Result so far: 1.0
The remainder is 12 after subtracting 21 from 33.
Bring next digit (6) of the dividend behind the 12 and repeat the process: 126 / 21

Going ahead to step 3:
When dividing 126 by 21, we get 6 with a remainder of 0.
The number 6 becomes the next digit in our result. 
Result so far: 16.0
The remainder is 0 after subtracting 126 from 126.
Append the next digit (6) from the dividend to 0 and continue with: 6 / 21

Advancing to step 4:
6 divided by 21 is 0 with a remainder of 6.
Record the quotient 0 as the next digit in the result. 
Result so far: 160.0
Subtracting 0 from 6 leaves us with 6.
Append the next digit (7) from the dividend to 6 and continue with: 67 / 21

Advancing to step 5:
If we divide 67 by 21, we get 3 and a remainder of 4.
Put 3 as the next digit of the answer. 
Result so far: 1603.0
The remainder is 4 after subtracting 63 from 67.
Append the next digit (9) from the dividend to 4 and continue with: 49 / 21

Step 6:
21 goes into 49 2 times with a remainder of 7.
Use 2 as the next digit of our solution. 
Result so far: 16032.0
Subtracting 42 from 49 leaves us with 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

Moving on to step 7:
The number 21 fits into 70 3 times, leaving a remainder of 7.
Write down 3 as next digit of the result. 
Result so far: 16032.3
Subtracting 63 from 70 leaves us with 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

Moving on to step 8:
70 divided by 21 is 3 with a remainder of 7.
Use 3 as the next digit of our solution. 
Result so far: 16032.33
The remainder is 7 after subtracting 63 from 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

The quotient of the division is 16032.33, and the remainder is 0.007.