Let's divide 675939 by 21
Our goal is to divide 675939 by 21.

Step 1:
If we divide 6 by 21, we get 0 and a remainder of 6.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 6, we end up with 6.
Grab the next digit (7) from the dividend, add it to 6, then carry on: 67 / 21

Advancing to step 2:
21 goes into 67 3 times with a remainder of 4.
The number 3 becomes the next digit in our result. 
Result so far: 3.0
Deduct 63 from 67 and we're left with 4.
Take the next digit (5) from the dividend and append it to 4, then repeat: 45 / 21

On to step 3:
45 divided by 21 is 2 with a remainder of 3.
The next digit of our result is 2. 
Result so far: 32.0
Deduct 42 from 45 and we're left with 3.
Bring next digit (9) of the dividend behind the 3 and repeat the process: 39 / 21

Step 4:
21 goes into 39 1 times with a remainder of 18.
Use 1 as the next digit of our solution. 
Result so far: 321.0
If we subtract 21 from 39, we get 18.
Grab the next digit (3) from the dividend, add it to 18, then carry on: 183 / 21

Going ahead to step 5:
21 can be fit into 183 8 times, resulting in a remainder of 15.
Record the quotient 8 as the next digit in the result. 
Result so far: 3218.0
The remainder is 15 after subtracting 168 from 183.
Bring next digit (9) of the dividend behind the 15 and repeat the process: 159 / 21

Going ahead to step 6:
The number 21 fits into 159 7 times, leaving a remainder of 12.
The next digit of our result is 7. 
Result so far: 32187.0
The remainder is 12 after subtracting 147 from 159.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Going ahead to step 7:
21 goes into 120 5 times with a remainder of 15.
Put 5 as the next digit of the answer. 
Result so far: 32187.5
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.

Advancing to step 8:
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: 32187.57
If we take 147 away from 150, we end up with 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Step 9:
21 can be fit into 30 1 times, resulting in a remainder of 9.
Write down 1 as next digit of the result. 
Result so far: 32187.571
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.

Going ahead to step 10:
If we divide 90 by 21, we get 4 and a remainder of 6.
Write down 4 as next digit of the result. 
Result so far: 32187.5714
If we subtract 84 from 90, we 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 11:
60 divided by 21 is 2 with a remainder of 18.
Record the quotient 2 as the next digit in the result. 
Result so far: 32187.57142
Deduct 42 from 60 and we're left 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.

Step 12:
21 goes into 180 8 times with a remainder of 12.
Put 8 as the next digit of the answer. 
Result so far: 32187.571428
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.

Going ahead to step 13:
When dividing 120 by 21, we get 5 with a remainder of 15.
Put 5 as the next digit of the answer. 
Result so far: 32187.5714285
If we take 105 away from 120, we end up 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.

Going ahead to step 14:
21 can be fit into 150 7 times, resulting in a remainder of 3.
Put 7 as the next digit of the answer. 
Result so far: 32187.57142857
Deduct 147 from 150 and we're left with 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

After the division, we end up with 32187.57142857 and a remainder of 3e-09.