6691380 ÷ 405 
Let's see how many times 405 fits into 6691380.

Going ahead to step 1:
405 can be fit into 6 0 times, resulting in a remainder of 6.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 6, we end up with 6.
Bring next digit (6) of the dividend behind the 6 and repeat the process: 66 / 405

Going ahead to step 2:
When dividing 66 by 405, we get 0 with a remainder of 66.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 66 after subtracting 0 from 66.
Bring next digit (9) of the dividend behind the 66 and repeat the process: 669 / 405

On to step 3:
405 goes into 669 1 times with a remainder of 264.
Put 1 as the next digit of the answer. 
Result so far: 1.0
If we subtract 405 from 669, we get 264.
Bring next digit (1) of the dividend behind the 264 and repeat the process: 2641 / 405

Step 4:
When dividing 2641 by 405, we get 6 with a remainder of 211.
The number 6 becomes the next digit in our result. 
Result so far: 16.0
If we take 2430 away from 2641, we end up with 211.
Include the next digit (3) from the dividend after 211, then repeat: 2113 / 405

Moving on to step 5:
2113 divided by 405 is 5 with a remainder of 88.
Write down 5 as next digit of the result. 
Result so far: 165.0
Subtracting 2025 from 2113 leaves us with 88.
Grab the next digit (8) from the dividend, add it to 88, then carry on: 888 / 405

Let's proceed to step 6:
405 can be fit into 888 2 times, resulting in a remainder of 78.
Use 2 as the next digit of our solution. 
Result so far: 1652.0
If we subtract 810 from 888, we get 78.
Fetch the next digit (0) from the dividend, attach it to 78 and continue: 780 / 405

On to step 7:
780 divided by 405 is 1 with a remainder of 375.
Record the quotient 1 as the next digit in the result. 
Result so far: 16521.0
If we take 405 away from 780, we end up with 375.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3750, and continue the process.

On to step 8:
If we divide 3750 by 405, we get 9 and a remainder of 105.
The number 9 becomes the next digit in our result. 
Result so far: 16521.9
Deduct 3645 from 3750 and we're left with 105.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1050, and continue the process.

Going ahead to step 9:
405 goes into 1050 2 times with a remainder of 240.
Use 2 as the next digit of our solution. 
Result so far: 16521.92
If we take 810 away from 1050, we end up with 240.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2400, and continue the process.

Let's proceed to step 10:
If we divide 2400 by 405, we get 5 and a remainder of 375.
Use 5 as the next digit of our solution. 
Result so far: 16521.925
If we take 2025 away from 2400, we end up with 375.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3750, and continue the process.

Going ahead to step 11:
When dividing 3750 by 405, we get 9 with a remainder of 105.
The next digit of our result is 9. 
Result so far: 16521.9259
If we take 3645 away from 3750, we end up with 105.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1050, and continue the process.

Step 12:
405 can be fit into 1050 2 times, resulting in a remainder of 240.
Write down 2 as next digit of the result. 
Result so far: 16521.92592
Deduct 810 from 1050 and we're left with 240.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2400, and continue the process.

Moving on to step 13:
When dividing 2400 by 405, we get 5 with a remainder of 375.
Record the quotient 5 as the next digit in the result. 
Result so far: 16521.925925
If we subtract 2025 from 2400, we get 375.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3750, and continue the process.

Going ahead to step 14:
405 can be fit into 3750 9 times, resulting in a remainder of 105.
The next digit of our result is 9. 
Result so far: 16521.9259259
The remainder is 105 after subtracting 3645 from 3750.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1050, and continue the process.

Let's proceed to step 15:
405 goes into 1050 2 times with a remainder of 240.
Record the quotient 2 as the next digit in the result. 
Result so far: 16521.92592592
Deduct 810 from 1050 and we're left with 240.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2400, and continue the process.

Our division results in 16521.92592592 with a remaining 2.4e-07.