Knock, Knock….who’s there?  Why it is is Saad, Anwaar, and Ali E.!  They have opened the doors to new math worlds!  Saad has unlocked the door to “Multiplication World” whereas, Ali E. and Anwaar have opened the doors to “Subtraction World”!  Way to go!  You are all superstars!  Will you be able to unlock the door next?