We look at the division of 712736 by 21 
We're looking to find how many times 21 goes into 712736.

Advancing to step 1:
If we divide 7 by 21, we get 0 and a remainder of 7.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 7 after subtracting 0 from 7.
Grab the next digit (1) from the dividend, add it to 7, then carry on: 71 / 21

Going ahead to step 2:
21 goes into 71 3 times with a remainder of 8.
Record the quotient 3 as the next digit in the result. 
Result so far: 3.0
If we take 63 away from 71, we end up with 8.
Fetch the next digit (2) from the dividend, attach it to 8 and continue: 82 / 21

Moving on to step 3:
21 can be fit into 82 3 times, resulting in a remainder of 19.
Put 3 as the next digit of the answer. 
Result so far: 33.0
If we take 63 away from 82, we end up with 19.
Bring next digit (7) of the dividend behind the 19 and repeat the process: 197 / 21

Let's proceed to step 4:
21 can be fit into 197 9 times, resulting in a remainder of 8.
The number 9 becomes the next digit in our result. 
Result so far: 339.0
The remainder is 8 after subtracting 189 from 197.
Bring next digit (3) of the dividend behind the 8 and repeat the process: 83 / 21

Let's proceed to step 5:
If we divide 83 by 21, we get 3 and a remainder of 20.
Use 3 as the next digit of our solution. 
Result so far: 3393.0
Deduct 63 from 83 and we're left with 20.
Bring next digit (6) of the dividend behind the 20 and repeat the process: 206 / 21

Moving on to step 6:
If we divide 206 by 21, we get 9 and a remainder of 17.
Record the quotient 9 as the next digit in the result. 
Result so far: 33939.0
The remainder is 17 after subtracting 189 from 206.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

On to step 7:
21 can be fit into 170 8 times, resulting in a remainder of 2.
The next digit of our result is 8. 
Result so far: 33939.8
Subtracting 168 from 170 leaves us with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

On to step 8:
When dividing 20 by 21, we get 0 with a remainder of 20.
Use 0 as the next digit of our solution. 
Result so far: 33939.8
Deduct 0 from 20 and we're left with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Advancing to step 9:
The number 21 fits into 200 9 times, leaving a remainder of 11.
Use 9 as the next digit of our solution. 
Result so far: 33939.809
If we subtract 189 from 200, we get 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Step 10:
21 can be fit into 110 5 times, resulting in a remainder of 5.
Record the quotient 5 as the next digit in the result. 
Result so far: 33939.8095
The remainder is 5 after subtracting 105 from 110.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Step 11:
When dividing 50 by 21, we get 2 with a remainder of 8.
Put 2 as the next digit of the answer. 
Result so far: 33939.80952
The remainder is 8 after subtracting 42 from 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Advancing to step 12:
21 goes into 80 3 times with a remainder of 17.
Put 3 as the next digit of the answer. 
Result so far: 33939.809523
If we subtract 63 from 80, we get 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

Let's proceed to step 13:
21 can be fit into 170 8 times, resulting in a remainder of 2.
Write down 8 as next digit of the result. 
Result so far: 33939.8095238
Subtracting 168 from 170 leaves us with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Going ahead to step 14:
The number 21 fits into 20 0 times, leaving a remainder of 20.
The number 0 becomes the next digit in our result. 
Result so far: 33939.8095238
If we subtract 0 from 20, we get 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

After the division, we end up with 33939.8095238 and a remainder of 2e-08.