910122 divided by 21 
Our goal is to divide 910122 by 21.

Going ahead to step 1:
When dividing 9 by 21, we get 0 with a remainder of 9.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 9, we get 9.
Bring next digit (1) of the dividend behind the 9 and repeat the process: 91 / 21

On to step 2:
21 goes into 91 4 times with a remainder of 7.
The number 4 becomes the next digit in our result. 
Result so far: 4.0
Subtract 84 from 91 to get 7.
Grab the next digit (0) from the dividend, add it to 7, then carry on: 70 / 21

Moving on to step 3:
The number 21 fits into 70 3 times, leaving a remainder of 7.
Use 3 as the next digit of our solution. 
Result so far: 43.0
If we take 63 away from 70, we end up with 7.
Grab the next digit (1) from the dividend, add it to 7, then carry on: 71 / 21

Going ahead to step 4:
The number 21 fits into 71 3 times, leaving a remainder of 8.
Use 3 as the next digit of our solution. 
Result so far: 433.0
Subtracting 63 from 71 leaves us with 8.
Grab the next digit (2) from the dividend, add it to 8, then carry on: 82 / 21

Going ahead to step 5:
82 divided by 21 is 3 with a remainder of 19.
Put 3 as the next digit of the answer. 
Result so far: 4333.0
Subtracting 63 from 82 leaves us with 19.
Take the next digit (2) from the dividend and append it to 19, then repeat: 192 / 21

Let's proceed to step 6:
The number 21 fits into 192 9 times, leaving a remainder of 3.
The next digit of our result is 9. 
Result so far: 43339.0
Subtracting 189 from 192 leaves us with 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

On to step 7:
If we divide 30 by 21, we get 1 and a remainder of 9.
Use 1 as the next digit of our solution. 
Result so far: 43339.1
Deduct 21 from 30 and we're left 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.

Step 8:
The number 21 fits into 90 4 times, leaving a remainder of 6.
Record the quotient 4 as the next digit in the result. 
Result so far: 43339.14
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 9:
60 divided by 21 is 2 with a remainder of 18.
Use 2 as the next digit of our solution. 
Result so far: 43339.142
If we take 42 away from 60, we end up with 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Going ahead to step 10:
When dividing 180 by 21, we get 8 with a remainder of 12.
Record the quotient 8 as the next digit in the result. 
Result so far: 43339.1428
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.

Moving on to step 11:
21 goes into 120 5 times with a remainder of 15.
Use 5 as the next digit of our solution. 
Result so far: 43339.14285
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.

Moving on to step 12:
21 can be fit into 150 7 times, resulting in a remainder of 3.
Record the quotient 7 as the next digit in the result. 
Result so far: 43339.142857
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.

Advancing to step 13:
21 goes into 30 1 times with a remainder of 9.
Write down 1 as next digit of the result. 
Result so far: 43339.1428571
Deduct 21 from 30 and we're left 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.

On to step 14:
When dividing 90 by 21, we get 4 with a remainder of 6.
Put 4 as the next digit of the answer. 
Result so far: 43339.14285714
Subtract 84 from 90 to get 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

The final result is 43339.14285714 with a remainder of 6e-09.