What is five hundred million, one hundred fifteen written in standard form?

The easy way is to write this number in part as they are mentioned

The first part says five hundred million or 500 million

which can we written as 500 X 1,000,000(million has 6 zeroes)

So that would make it 500,000,000

the second part says one hundred and fifteen or 115

Lets add these two value

500,000,000+115 = 500,000,115

So this would be our standard form