On the Double

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This alien needs your help in a hurry! Double digit addition problems need solving, and YOU are the perfect person for the job! Each contraption has one problem and four answer choices. Jump right in and don’t be shy! Add carefully to solve and master these machines and send the alien back to space!

Description

This alien needs your help in a hurry! Double digit addition problems need solving, and YOU are the perfect person for the job! Each contraption has one problem and four answer choices. Jump right in and don’t be shy! Add carefully to solve and master these machines and send the alien back to space!