When partnered with several of the 仮定（かてい） ‘assumption’ based expressions that are used in Japanese, the 格助詞（かくじょし） (case marking particle) と may be used to show a hypothesis about a certain result. This is one of the 結果（けっか） ‘result’ highlighting uses of と. Structures that may be seen are as follows:
(A) としたら (B) - When (A) is the result (B).
(A) とすれば (B) - If the result is (A), (B).
(A) とすると (B) - A result of (A) will be (B).
Although these nuances are slightly different, realistically they are used in almost exactly the same way, to express a possible (undetermined) result. This can be translated to ‘assuming that (A)’, or ‘if it were the case that (A)’.
To use these expressions, simply attach と and your chosen variation of したら to the end of any verb/い-Adjective, or noun/な-Adjective followed by だ.

• 来週（らいしゅう）出（で）かけるとしたらどこに行（い）きたい？
  If we were to go out next week, where would you want to go?
• 歯（は）が痛（いた）いとすれば、虫歯（むしば）かもしれません。
  If your tooth hurts, you might have a cavity.
• この壁（かべ）が真（ま）っ直（す）ぐだとすると、こっちの壁（かべ）は斜（なな）めっていうこと？
  Assuming that this wall here is straight, does that mean that this one here is slanted?
• 通勤（いどう）手段（しゅだん）が車（くるま）だとしたら、交通費（こうつうひ）は出（で）ません。
  Assuming that your mode of transportation is your car, transportation will not be compensated.