Let me see/think - Idioms by The Free Dictionary
let me see/think
let me see
Also, let's see. I'm thinking about it or trying to remember, as in Let me see, I'll be in Boston tomorrow and the next day. This idiom was first recorded in 1520.
ˌlet me ˈsee/ˈthink used when you are thinking or trying to remember something: Now let me see — where did he say he lived?