Let's divide 715405 by 21
Let's see how many times 21 fits into 715405.

Advancing to step 1:
The number 21 fits into 7 0 times, leaving a remainder of 7.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 7 to get 7.
Bring next digit (1) of the dividend behind the 7 and repeat the process: 71 / 21

Step 2:
71 divided by 21 is 3 with a remainder of 8.
The number 3 becomes the next digit in our result. 
Result so far: 3.0
If we subtract 63 from 71, we get 8.
Append the next digit (5) from the dividend to 8 and continue with: 85 / 21

Step 3:
When dividing 85 by 21, we get 4 with a remainder of 1.
Put 4 as the next digit of the answer. 
Result so far: 34.0
Deduct 84 from 85 and we're left with 1.
Take the next digit (4) from the dividend and append it to 1, then repeat: 14 / 21

Let's proceed to step 4:
If we divide 14 by 21, we get 0 and a remainder of 14.
The next digit of our result is 0. 
Result so far: 340.0
Deduct 0 from 14 and we're left with 14.
Grab the next digit (0) from the dividend, add it to 14, then carry on: 140 / 21

Let's proceed to step 5:
21 can be fit into 140 6 times, resulting in a remainder of 14.
Record the quotient 6 as the next digit in the result. 
Result so far: 3406.0
Subtracting 126 from 140 leaves us with 14.
Bring next digit (5) of the dividend behind the 14 and repeat the process: 145 / 21

Advancing to step 6:
The number 21 fits into 145 6 times, leaving a remainder of 19.
Write down 6 as next digit of the result. 
Result so far: 34066.0
If we take 126 away from 145, we end up 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.

On to step 7:
21 can be fit into 190 9 times, resulting in a remainder of 1.
Write down 9 as next digit of the result. 
Result so far: 34066.9
Deduct 189 from 190 and we're left 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.

Moving on to step 8:
The number 21 fits into 10 0 times, leaving a remainder of 10.
Use 0 as the next digit of our solution. 
Result so far: 34066.9
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.

Let's proceed to step 9:
21 can be fit into 100 4 times, resulting in a remainder of 16.
The next digit of our result is 4. 
Result so far: 34066.904
Subtract 84 from 100 to get 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 10:
If we divide 160 by 21, we get 7 and a remainder of 13.
Put 7 as the next digit of the answer. 
Result so far: 34066.9047
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.

Step 11:
If we divide 130 by 21, we get 6 and a remainder of 4.
The next digit of our result is 6. 
Result so far: 34066.90476
If we subtract 126 from 130, we get 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Step 12:
40 divided by 21 is 1 with a remainder of 19.
Put 1 as the next digit of the answer. 
Result so far: 34066.904761
The remainder is 19 after subtracting 21 from 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

Let's proceed to step 13:
The number 21 fits into 190 9 times, leaving a remainder of 1.
Write down 9 as next digit of the result. 
Result so far: 34066.9047619
Deduct 189 from 190 and we're left 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.

Moving on to step 14:
21 can be fit into 10 0 times, resulting in a remainder of 10.
Put 0 as the next digit of the answer. 
Result so far: 34066.9047619
The remainder is 10 after subtracting 0 from 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

The final outcome is 34066.9047619, with a leftover of 1e-08.