822126 ÷ 21 
We're looking to find how many times 21 goes into 822126.

Going ahead to step 1:
21 goes into 8 0 times with a remainder of 8.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 8, we end up with 8.
Bring next digit (2) of the dividend behind the 8 and repeat the process: 82 / 21

Going ahead to step 2:
21 can be fit into 82 3 times, resulting in a remainder of 19.
The number 3 becomes the next digit in our result. 
Result so far: 3.0
Subtract 63 from 82 to get 19.
Take the next digit (2) from the dividend and append it to 19, then repeat: 192 / 21

Let's proceed to step 3:
If we divide 192 by 21, we get 9 and a remainder of 3.
Put 9 as the next digit of the answer. 
Result so far: 39.0
The remainder is 3 after subtracting 189 from 192.
Take the next digit (1) from the dividend and append it to 3, then repeat: 31 / 21

Advancing to step 4:
21 goes into 31 1 times with a remainder of 10.
Write down 1 as next digit of the result. 
Result so far: 391.0
If we subtract 21 from 31, we get 10.
Include the next digit (2) from the dividend after 10, then repeat: 102 / 21

Going ahead to step 5:
The number 21 fits into 102 4 times, leaving a remainder of 18.
Write down 4 as next digit of the result. 
Result so far: 3914.0
If we take 84 away from 102, we end up with 18.
Grab the next digit (6) from the dividend, add it to 18, then carry on: 186 / 21

Advancing to step 6:
186 divided by 21 is 8 with a remainder of 18.
The next digit of our result is 8. 
Result so far: 39148.0
If we take 168 away from 186, 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.

On to step 7:
The number 21 fits into 180 8 times, leaving a remainder of 12.
Put 8 as the next digit of the answer. 
Result so far: 39148.8
Subtracting 168 from 180 leaves us 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.

Advancing to step 8:
When dividing 120 by 21, we get 5 with a remainder of 15.
Put 5 as the next digit of the answer. 
Result so far: 39148.85
The remainder is 15 after subtracting 105 from 120.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Going ahead to step 9:
21 can be fit into 150 7 times, resulting in a remainder of 3.
Write down 7 as next digit of the result. 
Result so far: 39148.857
Subtracting 147 from 150 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.

Moving on to step 10:
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: 39148.8571
If we subtract 21 from 30, we 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.

On to step 11:
The number 21 fits into 90 4 times, leaving a remainder of 6.
The number 4 becomes the next digit in our result. 
Result so far: 39148.85714
The remainder is 6 after subtracting 84 from 90.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Moving on to step 12:
If we divide 60 by 21, we get 2 and a remainder of 18.
The next digit of our result is 2. 
Result so far: 39148.857142
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.

On to step 13:
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: 39148.8571428
If we subtract 168 from 180, we get 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

On to step 14:
21 goes into 120 5 times with a remainder of 15.
Write down 5 as next digit of the result. 
Result so far: 39148.85714285
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.

Our division results in 39148.85714285 with a remaining 1.5e-08.