We divide 837040 by 21
We're looking to find how many times 21 goes into 837040.

Going ahead to step 1:
8 divided by 21 is 0 with a remainder of 8.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 8 after subtracting 0 from 8.
Bring next digit (3) of the dividend behind the 8 and repeat the process: 83 / 21

Step 2:
21 can be fit into 83 3 times, resulting in a remainder of 20.
The next digit of our result is 3. 
Result so far: 3.0
The remainder is 20 after subtracting 63 from 83.
Take the next digit (7) from the dividend and append it to 20, then repeat: 207 / 21

Step 3:
207 divided by 21 is 9 with a remainder of 18.
Use 9 as the next digit of our solution. 
Result so far: 39.0
Subtracting 189 from 207 leaves us with 18.
Grab the next digit (0) from the dividend, add it to 18, then carry on: 180 / 21

Let's proceed to step 4:
21 goes into 180 8 times with a remainder of 12.
The next digit of our result is 8. 
Result so far: 398.0
If we subtract 168 from 180, we get 12.
Include the next digit (4) from the dividend after 12, then repeat: 124 / 21

Let's proceed to step 5:
The number 21 fits into 124 5 times, leaving a remainder of 19.
Put 5 as the next digit of the answer. 
Result so far: 3985.0
Subtract 105 from 124 to get 19.
Take the next digit (0) from the dividend and append it to 19, then repeat: 190 / 21

On to step 6:
If we divide 190 by 21, we get 9 and a remainder of 1.
Write down 9 as next digit of the result. 
Result so far: 39859.0
Subtract 189 from 190 to get 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

On to step 7:
21 can be fit into 10 0 times, resulting in a remainder of 10.
The number 0 becomes the next digit in our result. 
Result so far: 39859.0
If we take 0 away from 10, we end up 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.

On to step 8:
The number 21 fits into 100 4 times, leaving a remainder of 16.
Use 4 as the next digit of our solution. 
Result so far: 39859.04
If we subtract 84 from 100, we 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.

Let's proceed to step 9:
When dividing 160 by 21, we get 7 with a remainder of 13.
Put 7 as the next digit of the answer. 
Result so far: 39859.047
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.

Let's proceed to step 10:
The number 21 fits into 130 6 times, leaving a remainder of 4.
The number 6 becomes the next digit in our result. 
Result so far: 39859.0476
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.

Let's proceed to step 11:
If we divide 40 by 21, we get 1 and a remainder of 19.
Use 1 as the next digit of our solution. 
Result so far: 39859.04761
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.

Advancing to step 12:
If we divide 190 by 21, we get 9 and a remainder of 1.
Write down 9 as next digit of the result. 
Result so far: 39859.047619
If we subtract 189 from 190, we get 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 13:
21 goes into 10 0 times with a remainder of 10.
The number 0 becomes the next digit in our result. 
Result so far: 39859.047619
Subtracting 0 from 10 leaves us 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.

Advancing to step 14:
21 goes into 100 4 times with a remainder of 16.
The number 4 becomes the next digit in our result. 
Result so far: 39859.04761904
If we subtract 84 from 100, we 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.

The quotient of the division is 39859.04761904, and the remainder is 1.6e-08.