Let's divide 81787320 by 509
We're looking to find how many times 509 goes into 81787320.

Moving on to step 1:
509 can be fit into 8 0 times, resulting in a remainder of 8.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 8 to get 8.
Bring next digit (1) of the dividend behind the 8 and repeat the process: 81 / 509

Moving on to step 2:
If we divide 81 by 509, we get 0 and a remainder of 81.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 81, we get 81.
Fetch the next digit (7) from the dividend, attach it to 81 and continue: 817 / 509

On to step 3:
The number 509 fits into 817 1 times, leaving a remainder of 308.
Write down 1 as next digit of the result. 
Result so far: 1.0
Deduct 509 from 817 and we're left with 308.
Fetch the next digit (8) from the dividend, attach it to 308 and continue: 3088 / 509

Advancing to step 4:
If we divide 3088 by 509, we get 6 and a remainder of 34.
Use 6 as the next digit of our solution. 
Result so far: 16.0
Deduct 3054 from 3088 and we're left with 34.
Include the next digit (7) from the dividend after 34, then repeat: 347 / 509

On to step 5:
The number 509 fits into 347 0 times, leaving a remainder of 347.
The number 0 becomes the next digit in our result. 
Result so far: 160.0
Deduct 0 from 347 and we're left with 347.
Take the next digit (3) from the dividend and append it to 347, then repeat: 3473 / 509

On to step 6:
When dividing 3473 by 509, we get 6 with a remainder of 419.
Use 6 as the next digit of our solution. 
Result so far: 1606.0
Subtracting 3054 from 3473 leaves us with 419.
Include the next digit (2) from the dividend after 419, then repeat: 4192 / 509

Moving on to step 7:
The number 509 fits into 4192 8 times, leaving a remainder of 120.
Use 8 as the next digit of our solution. 
Result so far: 16068.0
The remainder is 120 after subtracting 4072 from 4192.
Include the next digit (0) from the dividend after 120, then repeat: 1200 / 509

Going ahead to step 8:
509 goes into 1200 2 times with a remainder of 182.
Record the quotient 2 as the next digit in the result. 
Result so far: 160682.0
Subtract 1018 from 1200 to get 182.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1820, and continue the process.

Step 9:
If we divide 1820 by 509, we get 3 and a remainder of 293.
Use 3 as the next digit of our solution. 
Result so far: 160682.3
The remainder is 293 after subtracting 1527 from 1820.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2930, and continue the process.

On to step 10:
If we divide 2930 by 509, we get 5 and a remainder of 385.
Put 5 as the next digit of the answer. 
Result so far: 160682.35
Subtracting 2545 from 2930 leaves us with 385.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3850, and continue the process.

Step 11:
The number 509 fits into 3850 7 times, leaving a remainder of 287.
Write down 7 as next digit of the result. 
Result so far: 160682.357
Subtract 3563 from 3850 to get 287.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2870, and continue the process.

Going ahead to step 12:
The number 509 fits into 2870 5 times, leaving a remainder of 325.
The next digit of our result is 5. 
Result so far: 160682.3575
If we take 2545 away from 2870, we end up with 325.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3250, and continue the process.

Let's proceed to step 13:
The number 509 fits into 3250 6 times, leaving a remainder of 196.
The number 6 becomes the next digit in our result. 
Result so far: 160682.35756
The remainder is 196 after subtracting 3054 from 3250.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1960, and continue the process.

Going ahead to step 14:
When dividing 1960 by 509, we get 3 with a remainder of 433.
Use 3 as the next digit of our solution. 
Result so far: 160682.357563
The remainder is 433 after subtracting 1527 from 1960.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4330, and continue the process.

On to step 15:
4330 divided by 509 is 8 with a remainder of 258.
The next digit of our result is 8. 
Result so far: 160682.3575638
Deduct 4072 from 4330 and we're left with 258.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2580, and continue the process.

On to step 16:
509 goes into 2580 5 times with a remainder of 35.
Write down 5 as next digit of the result. 
Result so far: 160682.35756385
Subtracting 2545 from 2580 leaves us with 35.
Since there are no more digits in the dividend, we add a zero to the remainder making it 350, and continue the process.

The final outcome is 160682.35756385, with a leftover of 3.5e-08.