What does this mean?

The line on the Braves/Pirates today is -270/+240.

When I look at what Covers is showing, it's got 1.36 and 3.25.

What does the 1.36 and 3.25 mean?  I am clueless.  Can someone explain this to me?

Decimal odds: 2.00 represents -100.

The 3.25 is equivalent to +225 American odds, the 3.25 represents basically the stake plus the winnings. ($100+$225). Whereas with American odds +225 is the winnings only.

1.36 is equivalent to -278. Again the stake plus the winnings. At -278, A $100 will return $136 (stake + winnings).

That's probablt clear as mud, but hope it helps a little. 

They say Covid makes you dumber…best not leave your home. 

@svac

 I see, thanks for the explanation.  So anything under 2 is chalk?  Correct?  I like -270 & +240 way better.  Just from years of doing it that way.

@RXistrash

 After giving this some thought, I've been betting sports since 1990.

This new system of presenting the lines is a way for the sportsbooks to walk away from Nickle juice on baseball without admitting it.  If you notice, exactly ZERO of these lines are Nickle juice.