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2nd grade · Math · Unit 14 of 16

Arrays

Rows and columns

What your child practices

Adding equal rows to find the total in an array (up to 5 by 5), and cutting a rectangle into rows and columns of squares. This gets ready for multiplication.

Alaska content standards learning standard: 2.OA.4; 2.G.2 · adding to find the total in rectangular arrays, and partitioning a rectangle into rows and columns of squares

How we explain it

Children can open this short lesson before they practice.

  1. An array has equal rows.
  2. Add the same number once for each row.
  3. This is a first step to multiplying.

Example: 3 rows with 4 in each row. How many in all? 4 + 4 + 4 = 12. Answer: 12

Arrays in Alaska

In the Alaska content standards, this is unit 14 of 16 in 2nd grade Math, after Inches, Feet & Yards and before Add & Subtract to 1000.

Gradelings describes a child's practice on this unit as Beginning, Approaching, Meeting or Exceeding (Four practice steps). That reflects practice, not a report-card mark: the teacher decides the mark.

Source: Alaska Department of Education and Early Development

Sample questions

A taste of this unit. In the app, questions change every time and get easier or harder to match your child.

  1. Question 1

    There are 3 rows with 2 in each row. Which addition finds the total?

    • 2 + 2 + 2
    • 2 + 2 + 2 + 2
    • 3 + 3 + 3
    • 3 + 2

  2. Question 2

    A rectangle is cut into 2 rows and 4 columns of same-size squares. How many squares?

    • 12
    • 8
    • 9
    • 6

  3. Question 3

    There are 2 rows on a tray with 3 cookies in each. How many cookies in all?

    • 6
    • 9
    • 7
    • 5

  4. Question 4

    How many 🐞 are in the array?

    • 7
    • 16
    • 12
    • 9
    • 14

  5. Question 5

    There are 2 rows in a carton with 2 eggs in each. How many eggs in all?

    • 7
    • 6
    • 3
    • 4

  6. Question 6

    There are 2 rows with 4 in each row. Which addition finds the total?

    • 4 + 4 + 4
    • 4 + 4
    • 2 + 4
    • 5 + 5

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