837045 divided by 21 
We want to divide 837045 by 21.

Going ahead to step 1:
21 can be fit into 8 0 times, resulting in a remainder of 8.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 8 and we're left with 8.
Take the next digit (3) from the dividend and append it to 8, then repeat: 83 / 21

On to step 2:
21 goes into 83 3 times with a remainder of 20.
Write down 3 as next digit of the result. 
Result so far: 3.0
Subtracting 63 from 83 leaves us with 20.
Take the next digit (7) from the dividend and append it to 20, then repeat: 207 / 21

Moving on to step 3:
21 can be fit into 207 9 times, resulting in 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.
Fetch the next digit (0) from the dividend, attach it to 18 and continue: 180 / 21

Step 4:
21 goes into 180 8 times with a remainder of 12.
Use 8 as the next digit of our solution. 
Result so far: 398.0
If we subtract 168 from 180, we get 12.
Fetch the next digit (4) from the dividend, attach it to 12 and continue: 124 / 21

Step 5:
When dividing 124 by 21, we get 5 with a remainder of 19.
The number 5 becomes the next digit in our result. 
Result so far: 3985.0
Subtracting 105 from 124 leaves us with 19.
Fetch the next digit (5) from the dividend, attach it to 19 and continue: 195 / 21

Step 6:
The number 21 fits into 195 9 times, leaving a remainder of 6.
Use 9 as the next digit of our solution. 
Result so far: 39859.0
Subtracting 189 from 195 leaves us 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.

Step 7:
The number 21 fits into 60 2 times, leaving a remainder of 18.
Write down 2 as next digit of the result. 
Result so far: 39859.2
Subtract 42 from 60 to 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 8:
21 goes into 180 8 times with a remainder of 12.
Use 8 as the next digit of our solution. 
Result so far: 39859.28
Deduct 168 from 180 and we're left 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 9:
21 can be fit into 120 5 times, resulting in a remainder of 15.
The next digit of our result is 5. 
Result so far: 39859.285
Subtract 105 from 120 to get 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 10:
21 goes into 150 7 times with a remainder of 3.
Use 7 as the next digit of our solution. 
Result so far: 39859.2857
The remainder is 3 after subtracting 147 from 150.
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 11:
21 can be fit into 30 1 times, resulting in a remainder of 9.
Use 1 as the next digit of our solution. 
Result so far: 39859.28571
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 12:
The number 21 fits into 90 4 times, leaving a remainder of 6.
The next digit of our result is 4. 
Result so far: 39859.285714
Deduct 84 from 90 and we're left 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.

Let's proceed to step 13:
The number 21 fits into 60 2 times, leaving a remainder of 18.
The next digit of our result is 2. 
Result so far: 39859.2857142
Subtract 42 from 60 to 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.

Advancing to step 14:
When dividing 180 by 21, we get 8 with a remainder of 12.
Use 8 as the next digit of our solution. 
Result so far: 39859.28571428
Subtract 168 from 180 to 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.

The final outcome is 39859.28571428, with a leftover of 1.2e-08.