Array

Definition of Array

An Array is an arrangement of a set of numbers or objects in rows and columns.

More About Array

  • An array is normally used to write multiplication and division number sentences.
  • A multiplication array can easily be expressed as a repeated addition.
  • A division array can easily be expressed as a repeated subtraction.

Examples of Array

      example of Array
    The dots in the above figure are arranged in 4 rows and 7 columns. It can also be written as 7 � 4 = 7 + 7 + 7 + 7 = 28
      example of Array
    The cubes in the above figure are arranged in 4 rows and 9 columns. It can also be written as 9 � 4 = 9 + 9 + 9 + 9 = 36.

Video Examples: How to Write Math Arrays : Principles of Math


Solved Example Clockple on Approximate

Ques: Greg shaded the cells on a grid to make a rectangle, as shown. Which number sentence could be used to determine the total number of cells shaded to make the rectangle?

    example of Array
    Choices:
    A. 4 � 6 = 24
    B. 1 � 25 = 25
    C. 5 � 6 = 30
    D. 30 � 3 = 90
    Correct Answer: C

Solution:

    Step 1: On the grid shown, the rectangle is 5 rows wide with 6 cells shaded in each row and there are 30 cells shaded in all.
    Step 2: Number of rows � Number of cells shaded in each row = Total number of cells that make the rectangle
    Step 3: 5 � 6 = 30 [Substitute the values.]
    Step 4: So, the number sentence that could be used to determine the total number of cells shaded to make the rectangle is 5 � 6 = 30.
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