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How Many Arrays?

3.OA.1

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Will says he can can make at least four different arrays using 24 counters.

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Use counters and work with a partner to determine if Will is correct.

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Let’s Share

  • How many arrays did you build?
  • How did you record the arrays?
  • What equations represent the arrays?
  • How do you know you made all the possible arrays?
  • Do you agree with Will?

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Did you make either of these arrays?

What other arrays did you create?

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This model shows 24. Does this work as an array?

Why or Why not?

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Let’s Practice:

Use counters and create as many arrays as you can for 16.

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Draw and label the arrays that you create in your math journal.

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How many arrays were you able to create?

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Let’s Practice:

Use counters and create as many arrays as you can for 20.

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Draw and label the arrays that you create in your math journal.

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How many arrays were you able to create?

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Let’s Practice:

Use counters and create as many arrays as you can for 12.

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Draw and label the arrays that you create in your math journal.

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How many arrays were you able to create?

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Let’s Practice:

In your journal, write a multiplication equation to match this array.

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Can you use counters to represent 30 with a different array?

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Let’s Practice:

In your journal, write a multiplication equation to match this array.

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Can you use counters to represent 18 with a different array?

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Making Arrays

  • Choose two digit cards. The first digit card tells you how many rows to make. The second digit card tells you how many counters go in each row.
  • Make the array with counters. Draw the array.
  • Write a repeated addition equation to represent your array.
  • Write a multiplication equation to represent your array.
  • Repeat a total of ten times.

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How Many Arrays?

3.OA.1