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6th Class Mathematics Playing with Numbers Question Bank Playing with Numbers

  • question_answer
    Observe the following patterns. Then find the sum of 1+3+5+7+9+...+19.
    1 \[=1\times 1=1\]
    1+3 \[=2\times 2=4\]
    1+3+5 \[=3\times 3=9\]
    1+3+5+7 \[=4\times 4=16\]
    1+3+5+7+9 \[=5\times 5=25\]

    A)  121

    B)  81

    C)  100

    D)  64

    Correct Answer: C

    Solution :

    1 + 3 + 5 + 7 + 9 + ... + 19 \[=10\times 10=100\]


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