77787150 divided by 509 
We're looking to find how many times 509 goes into 77787150.

On to step 1:
7 divided by 509 is 0 with a remainder of 7.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 7 and we're left with 7.
Take the next digit (7) from the dividend and append it to 7, then repeat: 77 / 509

Moving on to step 2:
If we divide 77 by 509, we get 0 and a remainder of 77.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 77, we get 77.
Append the next digit (7) from the dividend to 77 and continue with: 777 / 509

Step 3:
509 can be fit into 777 1 times, resulting in a remainder of 268.
Use 1 as the next digit of our solution. 
Result so far: 1.0
Deduct 509 from 777 and we're left with 268.
Take the next digit (8) from the dividend and append it to 268, then repeat: 2688 / 509

Advancing to step 4:
509 can be fit into 2688 5 times, resulting in a remainder of 143.
Record the quotient 5 as the next digit in the result. 
Result so far: 15.0
Subtract 2545 from 2688 to get 143.
Bring next digit (7) of the dividend behind the 143 and repeat the process: 1437 / 509

On to step 5:
509 can be fit into 1437 2 times, resulting in a remainder of 419.
Put 2 as the next digit of the answer. 
Result so far: 152.0
Subtracting 1018 from 1437 leaves us with 419.
Fetch the next digit (1) from the dividend, attach it to 419 and continue: 4191 / 509

Let's proceed to step 6:
509 can be fit into 4191 8 times, resulting in a remainder of 119.
The number 8 becomes the next digit in our result. 
Result so far: 1528.0
The remainder is 119 after subtracting 4072 from 4191.
Include the next digit (5) from the dividend after 119, then repeat: 1195 / 509

Going ahead to step 7:
If we divide 1195 by 509, we get 2 and a remainder of 177.
The next digit of our result is 2. 
Result so far: 15282.0
If we subtract 1018 from 1195, we get 177.
Fetch the next digit (0) from the dividend, attach it to 177 and continue: 1770 / 509

Let's proceed to step 8:
509 can be fit into 1770 3 times, resulting in a remainder of 243.
Use 3 as the next digit of our solution. 
Result so far: 152823.0
The remainder is 243 after subtracting 1527 from 1770.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2430, and continue the process.

On to step 9:
If we divide 2430 by 509, we get 4 and a remainder of 394.
Write down 4 as next digit of the result. 
Result so far: 152823.4
Subtract 2036 from 2430 to get 394.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3940, and continue the process.

On to step 10:
509 goes into 3940 7 times with a remainder of 377.
The next digit of our result is 7. 
Result so far: 152823.47
If we take 3563 away from 3940, we end up with 377.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3770, and continue the process.

Advancing to step 11:
If we divide 3770 by 509, we get 7 and a remainder of 207.
Put 7 as the next digit of the answer. 
Result so far: 152823.477
Subtract 3563 from 3770 to get 207.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2070, and continue the process.

The final outcome is 152823.477, with a leftover of 0.0207.