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2nd grade · Math · Unit 14 of 18

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.

New York State Learning Standards learning standard: NY-2.OA.4; NY-2.G.2 · adding to find the total in rectangular arrays, and splitting 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 New York

In the New York State Learning Standards, this is unit 14 of 18 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: New York State Education Department (NYSED)

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 4 in each row. Which addition finds the total?

    • 3 + 4
    • 5 + 5 + 5
    • 4 + 4 + 4 + 4
    • 4 + 4 + 4

  2. Question 2

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

    • 8
    • 18
    • 17
    • 16

  3. Question 3

    How many 🐞 are in the array?

    • 17
    • 15
    • 18
    • 10
    • 8

  4. Question 4

    There are 4 rows in a garden with 5 plants in each. How many plants in all?

    • 9
    • 22
    • 25
    • 20

  5. Question 5

    How many 🌼 are in the array?

    • 12
    • 10
    • 7
    • 15
    • 8

  6. Question 6

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

    • 6
    • 8
    • 12
    • 9

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