We're dividing 40091021 by 830 
Let's see how many times 830 fits into 40091021.

On to step 1:
When dividing 4 by 830, we get 0 with a remainder of 4.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 4 to get 4.
Fetch the next digit (0) from the dividend, attach it to 4 and continue: 40 / 830

Moving on to step 2:
The number 830 fits into 40 0 times, leaving a remainder of 40.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 40 to get 40.
Bring next digit (0) of the dividend behind the 40 and repeat the process: 400 / 830

Step 3:
830 goes into 400 0 times with a remainder of 400.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 400, we end up with 400.
Take the next digit (9) from the dividend and append it to 400, then repeat: 4009 / 830

Let's proceed to step 4:
When dividing 4009 by 830, we get 4 with a remainder of 689.
The next digit of our result is 4. 
Result so far: 4.0
If we subtract 3320 from 4009, we get 689.
Include the next digit (1) from the dividend after 689, then repeat: 6891 / 830

Going ahead to step 5:
6891 divided by 830 is 8 with a remainder of 251.
The number 8 becomes the next digit in our result. 
Result so far: 48.0
Subtracting 6640 from 6891 leaves us with 251.
Append the next digit (0) from the dividend to 251 and continue with: 2510 / 830

Going ahead to step 6:
830 goes into 2510 3 times with a remainder of 20.
Use 3 as the next digit of our solution. 
Result so far: 483.0
Subtract 2490 from 2510 to get 20.
Append the next digit (2) from the dividend to 20 and continue with: 202 / 830

Going ahead to step 7:
202 divided by 830 is 0 with a remainder of 202.
Put 0 as the next digit of the answer. 
Result so far: 4830.0
Subtracting 0 from 202 leaves us with 202.
Append the next digit (1) from the dividend to 202 and continue with: 2021 / 830

Moving on to step 8:
830 can be fit into 2021 2 times, resulting in a remainder of 361.
Put 2 as the next digit of the answer. 
Result so far: 48302.0
If we take 1660 away from 2021, we end up with 361.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3610, and continue the process.

Let's proceed to step 9:
830 can be fit into 3610 4 times, resulting in a remainder of 290.
The next digit of our result is 4. 
Result so far: 48302.4
If we take 3320 away from 3610, we end up with 290.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2900, and continue the process.

On to step 10:
830 can be fit into 2900 3 times, resulting in a remainder of 410.
The number 3 becomes the next digit in our result. 
Result so far: 48302.43
Deduct 2490 from 2900 and we're left with 410.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4100, and continue the process.

Step 11:
The number 830 fits into 4100 4 times, leaving a remainder of 780.
The next digit of our result is 4. 
Result so far: 48302.434
If we take 3320 away from 4100, we end up with 780.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7800, and continue the process.

Advancing to step 12:
The number 830 fits into 7800 9 times, leaving a remainder of 330.
Write down 9 as next digit of the result. 
Result so far: 48302.4349
If we subtract 7470 from 7800, we get 330.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3300, and continue the process.

Moving on to step 13:
830 can be fit into 3300 3 times, resulting in a remainder of 810.
Put 3 as the next digit of the answer. 
Result so far: 48302.43493
The remainder is 810 after subtracting 2490 from 3300.
Since there are no more digits in the dividend, we add a zero to the remainder making it 8100, and continue the process.

Advancing to step 14:
830 goes into 8100 9 times with a remainder of 630.
Use 9 as the next digit of our solution. 
Result so far: 48302.434939
Deduct 7470 from 8100 and we're left with 630.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6300, and continue the process.

Going ahead to step 15:
830 can be fit into 6300 7 times, resulting in a remainder of 490.
The number 7 becomes the next digit in our result. 
Result so far: 48302.4349397
If we take 5810 away from 6300, we end up with 490.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4900, and continue the process.

Let's proceed to step 16:
If we divide 4900 by 830, we get 5 and a remainder of 750.
Record the quotient 5 as the next digit in the result. 
Result so far: 48302.43493975
If we subtract 4150 from 4900, we get 750.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7500, and continue the process.

After the division, we end up with 48302.43493975 and a remainder of 7.5e-07.