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3rd Class Mathematics Addition and Subtraction Question Bank Addition and Subtraction

  • question_answer
    A number machine takes any number put into it, adds 20, then subtracts 10, and then adds 8. If the number 13 is put into the machine, what number comes out?

    A) 13                         

    B) 23

    C) 31                           

    D) 33

    Correct Answer: C

    Solution :

    • 13 + 20 = 33
    • 33 - 10 = 23
    • 23 + 8 = 31


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