Mathematics
Grade-1
Easy

Question

Complete the series of numbers:
80, ____, ____

  1. 60 - 70
  2. 90, 100
  3. 30 - 40
  4. 20 - 40

Hint:

In a given series, the difference of any two consecutive numbers or terms is the same and positive.

The correct answer is: 90, 100


    Here, we are to find the missing terms of the series.
    A) Putting 20 and -40, we get
    20-80=-60.
    and, -40-20=-60.
    Here, the difference is the same.
    B) Putting 60 and -70, we get
    60-80=-20.
    and -70-60=-130.
    Here, the difference is not same.
    C)Putting 30 and -40, we get
    30-80=-50
    and, -40-30=-70.
    Here, the difference is not same.
    D) Putting 90 and 100, we get
    90-80=10
    and, 100-90=10.
    Here, the difference is same and positive.
    Hence, the correct option is D.

    The next term of the series can calculated by adding the common difference.

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