We divide 909631 by 21
We're looking to find how many times 21 goes into 909631.

Advancing to step 1:
21 goes into 9 0 times with a remainder of 9.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 9 after subtracting 0 from 9.
Fetch the next digit (0) from the dividend, attach it to 9 and continue: 90 / 21

Moving on to step 2:
21 goes into 90 4 times with a remainder of 6.
Record the quotient 4 as the next digit in the result. 
Result so far: 4.0
Subtracting 84 from 90 leaves us with 6.
Include the next digit (9) from the dividend after 6, then repeat: 69 / 21

On to step 3:
The number 21 fits into 69 3 times, leaving a remainder of 6.
Put 3 as the next digit of the answer. 
Result so far: 43.0
If we take 63 away from 69, we end up with 6.
Bring next digit (6) of the dividend behind the 6 and repeat the process: 66 / 21

Advancing to step 4:
When dividing 66 by 21, we get 3 with a remainder of 3.
Use 3 as the next digit of our solution. 
Result so far: 433.0
The remainder is 3 after subtracting 63 from 66.
Bring next digit (3) of the dividend behind the 3 and repeat the process: 33 / 21

Moving on to step 5:
21 goes into 33 1 times with a remainder of 12.
Use 1 as the next digit of our solution. 
Result so far: 4331.0
If we subtract 21 from 33, we get 12.
Bring next digit (1) of the dividend behind the 12 and repeat the process: 121 / 21

Let's proceed to step 6:
When dividing 121 by 21, we get 5 with a remainder of 16.
Write down 5 as next digit of the result. 
Result so far: 43315.0
Subtract 105 from 121 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.

Step 7:
The number 21 fits into 160 7 times, leaving a remainder of 13.
Record the quotient 7 as the next digit in the result. 
Result so far: 43315.7
If we take 147 away from 160, we end up 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.

On to step 8:
21 can be fit into 130 6 times, resulting in a remainder of 4.
The next digit of our result is 6. 
Result so far: 43315.76
Deduct 126 from 130 and we're left 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 9:
The number 21 fits into 40 1 times, leaving a remainder of 19.
Use 1 as the next digit of our solution. 
Result so far: 43315.761
Subtract 21 from 40 to get 19.
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 10:
21 can be fit into 190 9 times, resulting in a remainder of 1.
Record the quotient 9 as the next digit in the result. 
Result so far: 43315.7619
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 11:
When dividing 10 by 21, we get 0 with a remainder of 10.
The number 0 becomes the next digit in our result. 
Result so far: 43315.7619
Deduct 0 from 10 and we're left with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Going ahead to step 12:
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: 43315.761904
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 13:
21 can be fit into 160 7 times, resulting in a remainder of 13.
The next digit of our result is 7. 
Result so far: 43315.7619047
If we take 147 away from 160, we end up 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.

On to step 14:
21 can be fit into 130 6 times, resulting in a remainder of 4.
Write down 6 as next digit of the result. 
Result so far: 43315.76190476
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.

Our division results in 43315.76190476 with a remaining 4e-09.