Mathematics
Grade-4-
Easy

Question

This increasing number pattern was made using a rule.

The rule that could have been used to make this pattern is

  1. Multiply by 3    
  2. Add 9    
  3. Multiply by 9    
  4. Add 7    

Hint:

We are given a sequence of numbers. It is increasing number pattern. We are asked to guess the rules required to form this pattern. We are given four options. We can try them one by one to find the rule used to form the pattern.

The correct answer is: Add 9


    The given sequence is 12, 21, 30, 39, 48, 57
    We have to guess the rules used to write the above sequence.
    Let’s check the options one by one. We will perform the operations and check if it matches the sequence.
    Option A : Multiply by 3
    Let’s take the first term of the sequence and start the operations.
    12 × 3 = 36
    It is not the second term of the above sequence. So, option A is wrong.
    Option B : Add 7
    12 + 7 = 19
    It is not the second term of the above sequence. So, option B is wrong.
    Option C : Multiply by 10
    12 × 10 = 120
    It is not the second term of the above sequence. So, option C is wrong.
    Option D : Add 9
    12 + 9 = 21
    21 + 9 = 30
    30 + 9 = 39
    39 + 9 = 48
    48 + 9 = 57
    So, the sequence becomes 12, 21, 30, 39, 48, 57. It matches the given sequence.
    Therefore, option D is the right option.



    For such questions, we should know the basic operations. When the rule used to write the pattern is not mentioned, we have to use all four operations to check the pattern. The operations are addition, subtraction, division, and multiplication.

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