660733 ÷ 21 
Let's see how many times 21 fits into 660733.

Let's proceed to step 1:
21 can be fit into 6 0 times, resulting in a remainder of 6.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 6, we get 6.
Fetch the next digit (6) from the dividend, attach it to 6 and continue: 66 / 21

Step 2:
21 goes into 66 3 times with a remainder of 3.
Write down 3 as next digit of the result. 
Result so far: 3.0
Subtracting 63 from 66 leaves us with 3.
Grab the next digit (0) from the dividend, add it to 3, then carry on: 30 / 21

Advancing to step 3:
The number 21 fits into 30 1 times, leaving a remainder of 9.
Use 1 as the next digit of our solution. 
Result so far: 31.0
If we take 21 away from 30, we end up with 9.
Take the next digit (7) from the dividend and append it to 9, then repeat: 97 / 21

Going ahead to step 4:
21 can be fit into 97 4 times, resulting in a remainder of 13.
The number 4 becomes the next digit in our result. 
Result so far: 314.0
If we subtract 84 from 97, we get 13.
Include the next digit (3) from the dividend after 13, then repeat: 133 / 21

Step 5:
If we divide 133 by 21, we get 6 and a remainder of 7.
Write down 6 as next digit of the result. 
Result so far: 3146.0
If we take 126 away from 133, we end up with 7.
Include the next digit (3) from the dividend after 7, then repeat: 73 / 21

Moving on to step 6:
21 goes into 73 3 times with a remainder of 10.
The next digit of our result is 3. 
Result so far: 31463.0
The remainder is 10 after subtracting 63 from 73.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Moving on to step 7:
100 divided by 21 is 4 with a remainder of 16.
Record the quotient 4 as the next digit in the result. 
Result so far: 31463.4
If we take 84 away from 100, we end up with 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Moving on to step 8:
21 goes into 160 7 times with a remainder of 13.
Record the quotient 7 as the next digit in the result. 
Result so far: 31463.47
Subtract 147 from 160 to get 13.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

Moving on to step 9:
The number 21 fits into 130 6 times, leaving a remainder of 4.
Use 6 as the next digit of our solution. 
Result so far: 31463.476
Subtracting 126 from 130 leaves us with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Going ahead to step 10:
21 goes into 40 1 times with a remainder of 19.
Record the quotient 1 as the next digit in the result. 
Result so far: 31463.4761
Deduct 21 from 40 and we're left with 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

Advancing to step 11:
190 divided by 21 is 9 with a remainder of 1.
Put 9 as the next digit of the answer. 
Result so far: 31463.47619
Subtracting 189 from 190 leaves us with 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Let's proceed to step 12:
10 divided by 21 is 0 with a remainder of 10.
Write down 0 as next digit of the result. 
Result so far: 31463.47619
Subtract 0 from 10 to get 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

On to step 13:
100 divided by 21 is 4 with a remainder of 16.
The next digit of our result is 4. 
Result so far: 31463.4761904
If we take 84 away from 100, we end up with 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Let's proceed to step 14:
The number 21 fits into 160 7 times, leaving a remainder of 13.
Use 7 as the next digit of our solution. 
Result so far: 31463.47619047
Deduct 147 from 160 and we're left with 13.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

The final outcome is 31463.47619047, with a leftover of 1.3e-08.