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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.

Oregon State Standards learning standard: 2.OA.C.4; 2.GM.A.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

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

    How many 🍓 are in the array?

    • 18
    • 15
    • 8
    • 12
    • 10

  2. Question 2

    There are 5 rows in a carton with 2 eggs in each. How many eggs in all?

    • 10
    • 12
    • 7
    • 11

  3. Question 3

    There are 2 rows with 5 in each row. Which addition finds the total?

    • 6 + 6
    • 5 + 5
    • 5 + 5 + 5
    • 2 + 5

  4. Question 4

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

    • 6
    • 12
    • 9
    • 8

  5. Question 5

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

    • 6
    • 8
    • 12
    • 9

  6. Question 6

    There are 2 rows with 5 in each row. Which addition finds the total?

    • 2 + 5
    • 5 + 5
    • 6 + 6
    • 5 + 5 + 5

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