Let's divide 81421785 by 409
We want to figure out the number of times 81421785 can be divided by 409.

Advancing to step 1:
The number 409 fits into 8 0 times, leaving a remainder of 8.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 8 leaves us with 8.
Take the next digit (1) from the dividend and append it to 8, then repeat: 81 / 409

Moving on to step 2:
409 goes into 81 0 times with a remainder of 81.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 81 leaves us with 81.
Bring next digit (4) of the dividend behind the 81 and repeat the process: 814 / 409

Moving on to step 3:
When dividing 814 by 409, we get 1 with a remainder of 405.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
Subtracting 409 from 814 leaves us with 405.
Take the next digit (2) from the dividend and append it to 405, then repeat: 4052 / 409

Step 4:
The number 409 fits into 4052 9 times, leaving a remainder of 371.
Use 9 as the next digit of our solution. 
Result so far: 19.0
Subtracting 3681 from 4052 leaves us with 371.
Append the next digit (1) from the dividend to 371 and continue with: 3711 / 409

Advancing to step 5:
409 can be fit into 3711 9 times, resulting in a remainder of 30.
The number 9 becomes the next digit in our result. 
Result so far: 199.0
If we take 3681 away from 3711, we end up with 30.
Fetch the next digit (7) from the dividend, attach it to 30 and continue: 307 / 409

Moving on to step 6:
The number 409 fits into 307 0 times, leaving a remainder of 307.
The next digit of our result is 0. 
Result so far: 1990.0
Subtracting 0 from 307 leaves us with 307.
Bring next digit (8) of the dividend behind the 307 and repeat the process: 3078 / 409

Going ahead to step 7:
When dividing 3078 by 409, we get 7 with a remainder of 215.
Use 7 as the next digit of our solution. 
Result so far: 19907.0
Subtracting 2863 from 3078 leaves us with 215.
Take the next digit (5) from the dividend and append it to 215, then repeat: 2155 / 409

On to step 8:
The number 409 fits into 2155 5 times, leaving a remainder of 110.
The number 5 becomes the next digit in our result. 
Result so far: 199075.0
The remainder is 110 after subtracting 2045 from 2155.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1100, and continue the process.

Moving on to step 9:
409 goes into 1100 2 times with a remainder of 282.
Write down 2 as next digit of the result. 
Result so far: 199075.2
The remainder is 282 after subtracting 818 from 1100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2820, and continue the process.

Going ahead to step 10:
409 goes into 2820 6 times with a remainder of 366.
The next digit of our result is 6. 
Result so far: 199075.26
The remainder is 366 after subtracting 2454 from 2820.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3660, and continue the process.

Going ahead to step 11:
When dividing 3660 by 409, we get 8 with a remainder of 388.
Record the quotient 8 as the next digit in the result. 
Result so far: 199075.268
Subtract 3272 from 3660 to get 388.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3880, and continue the process.

On to step 12:
3880 divided by 409 is 9 with a remainder of 199.
The next digit of our result is 9. 
Result so far: 199075.2689
If we take 3681 away from 3880, we end up with 199.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1990, and continue the process.

Moving on to step 13:
When dividing 1990 by 409, we get 4 with a remainder of 354.
Write down 4 as next digit of the result. 
Result so far: 199075.26894
Subtracting 1636 from 1990 leaves us with 354.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3540, and continue the process.

Moving on to step 14:
409 can be fit into 3540 8 times, resulting in a remainder of 268.
The number 8 becomes the next digit in our result. 
Result so far: 199075.268948
If we take 3272 away from 3540, we end up with 268.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2680, and continue the process.

Going ahead to step 15:
The number 409 fits into 2680 6 times, leaving a remainder of 226.
The number 6 becomes the next digit in our result. 
Result so far: 199075.2689486
Deduct 2454 from 2680 and we're left with 226.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2260, and continue the process.

Going ahead to step 16:
2260 divided by 409 is 5 with a remainder of 215.
Use 5 as the next digit of our solution. 
Result so far: 199075.26894865
The remainder is 215 after subtracting 2045 from 2260.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2150, and continue the process.

The final result is 199075.26894865 with a remainder of 2.15e-07.