We look at the division of 715157 by 21 
Let's see how many times 21 fits into 715157.

Going ahead to step 1:
If we divide 7 by 21, we get 0 and a remainder of 7.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 7, we end up with 7.
Grab the next digit (1) from the dividend, add it to 7, then carry on: 71 / 21

Step 2:
21 goes into 71 3 times with a remainder of 8.
The number 3 becomes the next digit in our result. 
Result so far: 3.0
The remainder is 8 after subtracting 63 from 71.
Grab the next digit (5) from the dividend, add it to 8, then carry on: 85 / 21

Let's proceed to step 3:
21 can be fit into 85 4 times, resulting in a remainder of 1.
The number 4 becomes the next digit in our result. 
Result so far: 34.0
Subtract 84 from 85 to get 1.
Bring next digit (1) of the dividend behind the 1 and repeat the process: 11 / 21

On to step 4:
The number 21 fits into 11 0 times, leaving a remainder of 11.
Write down 0 as next digit of the result. 
Result so far: 340.0
Deduct 0 from 11 and we're left with 11.
Fetch the next digit (5) from the dividend, attach it to 11 and continue: 115 / 21

Moving on to step 5:
If we divide 115 by 21, we get 5 and a remainder of 10.
Use 5 as the next digit of our solution. 
Result so far: 3405.0
Deduct 105 from 115 and we're left with 10.
Include the next digit (7) from the dividend after 10, then repeat: 107 / 21

Going ahead to step 6:
21 goes into 107 5 times with a remainder of 2.
Record the quotient 5 as the next digit in the result. 
Result so far: 34055.0
The remainder is 2 after subtracting 105 from 107.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Let's proceed to step 7:
21 goes into 20 0 times with a remainder of 20.
Put 0 as the next digit of the answer. 
Result so far: 34055.0
Subtracting 0 from 20 leaves us 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.

Let's proceed to step 8:
21 goes into 200 9 times with a remainder of 11.
Put 9 as the next digit of the answer. 
Result so far: 34055.09
If we take 189 away from 200, we end up with 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

On to step 9:
21 can be fit into 110 5 times, resulting in a remainder of 5.
Put 5 as the next digit of the answer. 
Result so far: 34055.095
If we take 105 away from 110, we end up with 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Step 10:
If we divide 50 by 21, we get 2 and a remainder of 8.
The number 2 becomes the next digit in our result. 
Result so far: 34055.0952
Deduct 42 from 50 and we're left with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Moving on to step 11:
21 can be fit into 80 3 times, resulting in a remainder of 17.
Put 3 as the next digit of the answer. 
Result so far: 34055.09523
The remainder is 17 after subtracting 63 from 80.
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 12:
If we divide 170 by 21, we get 8 and a remainder of 2.
Use 8 as the next digit of our solution. 
Result so far: 34055.095238
The remainder is 2 after subtracting 168 from 170.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Let's proceed to step 13:
20 divided by 21 is 0 with a remainder of 20.
The number 0 becomes the next digit in our result. 
Result so far: 34055.095238
Subtract 0 from 20 to 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.

Let's proceed to step 14:
When dividing 200 by 21, we get 9 with a remainder of 11.
Write down 9 as next digit of the result. 
Result so far: 34055.09523809
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.

The final outcome is 34055.09523809, with a leftover of 1.1e-08.