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5th Class Mathematics Number System and its Operations Question Bank Number System

  • question_answer
    Martin is pasting pieces of square coloured paper of equal size onto a board measuring 72 cm by 90 cm. If only whole square pieces are used, and the board is to be completely covered, find the largest possible length of the side of each square coloured paper.

    A) 72                               

    B) 18     

    C) 17                               

    D) 90

    Correct Answer: B

    Solution :

    The largest possible length of the side of each square coloured paper = GCF of 72 and 90. Factors of \[72=2\times 2\times 2\times 3\times 3\] Factors of \[90=3\times 3\times 2\times 5\] GCF = \[2\times 3\times 3=18\]       


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