We're dividing 912045 by 21 
We want to divide 912045 by 21.

Step 1:
If we divide 9 by 21, we get 0 and a remainder of 9.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 9, we end up with 9.
Take the next digit (1) from the dividend and append it to 9, then repeat: 91 / 21

Let's proceed to step 2:
If we divide 91 by 21, we get 4 and a remainder of 7.
Put 4 as the next digit of the answer. 
Result so far: 4.0
Subtract 84 from 91 to get 7.
Include the next digit (2) from the dividend after 7, then repeat: 72 / 21

Going ahead to step 3:
If we divide 72 by 21, we get 3 and a remainder of 9.
The next digit of our result is 3. 
Result so far: 43.0
Deduct 63 from 72 and we're left with 9.
Include the next digit (0) from the dividend after 9, then repeat: 90 / 21

Moving on to step 4:
21 can be fit into 90 4 times, resulting in a remainder of 6.
The number 4 becomes the next digit in our result. 
Result so far: 434.0
Subtracting 84 from 90 leaves us with 6.
Append the next digit (4) from the dividend to 6 and continue with: 64 / 21

Advancing to step 5:
The number 21 fits into 64 3 times, leaving a remainder of 1.
Put 3 as the next digit of the answer. 
Result so far: 4343.0
If we subtract 63 from 64, we get 1.
Bring next digit (5) of the dividend behind the 1 and repeat the process: 15 / 21

Advancing to step 6:
15 divided by 21 is 0 with a remainder of 15.
The next digit of our result is 0. 
Result so far: 43430.0
The remainder is 15 after subtracting 0 from 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Advancing to step 7:
The number 21 fits into 150 7 times, leaving a remainder of 3.
Write down 7 as next digit of the result. 
Result so far: 43430.7
Subtract 147 from 150 to get 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Step 8:
The number 21 fits into 30 1 times, leaving a remainder of 9.
Put 1 as the next digit of the answer. 
Result so far: 43430.71
Subtract 21 from 30 to get 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Advancing to step 9:
21 goes into 90 4 times with a remainder of 6.
Write down 4 as next digit of the result. 
Result so far: 43430.714
If we take 84 away from 90, we end up with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Advancing to step 10:
21 goes into 60 2 times with a remainder of 18.
Record the quotient 2 as the next digit in the result. 
Result so far: 43430.7142
If we subtract 42 from 60, we get 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Moving on to step 11:
21 goes into 180 8 times with a remainder of 12.
The next digit of our result is 8. 
Result so far: 43430.71428
If we take 168 away from 180, we end up with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Going ahead to step 12:
If we divide 120 by 21, we get 5 and a remainder of 15.
The number 5 becomes the next digit in our result. 
Result so far: 43430.714285
Subtracting 105 from 120 leaves us with 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Let's proceed to step 13:
21 goes into 150 7 times with a remainder of 3.
Put 7 as the next digit of the answer. 
Result so far: 43430.7142857
If we subtract 147 from 150, we get 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Let's proceed to step 14:
30 divided by 21 is 1 with a remainder of 9.
Put 1 as the next digit of the answer. 
Result so far: 43430.71428571
Subtracting 21 from 30 leaves us with 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Our division results in 43430.71428571 with a remaining 9e-09.