We divide 905729 by 21
We want to figure out the number of times 905729 can be divided by 21.

Going ahead to step 1:
When dividing 9 by 21, we get 0 with a remainder of 9.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 9 to get 9.
Fetch the next digit (0) from the dividend, attach it to 9 and continue: 90 / 21

Going ahead to step 2:
21 goes into 90 4 times with a remainder of 6.
Use 4 as the next digit of our solution. 
Result so far: 4.0
If we take 84 away from 90, we end up with 6.
Take the next digit (5) from the dividend and append it to 6, then repeat: 65 / 21

Advancing to step 3:
When dividing 65 by 21, we get 3 with a remainder of 2.
The next digit of our result is 3. 
Result so far: 43.0
The remainder is 2 after subtracting 63 from 65.
Fetch the next digit (7) from the dividend, attach it to 2 and continue: 27 / 21

Let's proceed to step 4:
21 goes into 27 1 times with a remainder of 6.
Record the quotient 1 as the next digit in the result. 
Result so far: 431.0
If we subtract 21 from 27, we get 6.
Fetch the next digit (2) from the dividend, attach it to 6 and continue: 62 / 21

Advancing to step 5:
The number 21 fits into 62 2 times, leaving a remainder of 20.
Record the quotient 2 as the next digit in the result. 
Result so far: 4312.0
Subtract 42 from 62 to get 20.
Take the next digit (9) from the dividend and append it to 20, then repeat: 209 / 21

Step 6:
209 divided by 21 is 9 with a remainder of 20.
Record the quotient 9 as the next digit in the result. 
Result so far: 43129.0
If we subtract 189 from 209, 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.

Moving on to step 7:
21 goes into 200 9 times with a remainder of 11.
The next digit of our result is 9. 
Result so far: 43129.9
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 8:
When dividing 110 by 21, we get 5 with a remainder of 5.
Write down 5 as next digit of the result. 
Result so far: 43129.95
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.

Going ahead to step 9:
21 goes into 50 2 times with a remainder of 8.
The next digit of our result is 2. 
Result so far: 43129.952
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.

Moving on to step 10:
21 goes into 80 3 times with a remainder of 17.
Use 3 as the next digit of our solution. 
Result so far: 43129.9523
If we take 63 away from 80, we end up with 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

Moving on to step 11:
When dividing 170 by 21, we get 8 with a remainder of 2.
Put 8 as the next digit of the answer. 
Result so far: 43129.95238
Deduct 168 from 170 and we're left 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.

Advancing to step 12:
21 can be fit into 20 0 times, resulting in a remainder of 20.
Record the quotient 0 as the next digit in the result. 
Result so far: 43129.95238
The remainder is 20 after subtracting 0 from 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

On to step 13:
The number 21 fits into 200 9 times, leaving a remainder of 11.
Write down 9 as next digit of the result. 
Result so far: 43129.9523809
Subtract 189 from 200 to 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.

Let's proceed to step 14:
21 goes into 110 5 times with a remainder of 5.
Write down 5 as next digit of the result. 
Result so far: 43129.95238095
Deduct 105 from 110 and we're left 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.

Our division results in 43129.95238095 with a remaining 5e-09.