Lesson 7 What is an Array?

    • Let’s learn about arrays.

Warm-up Which One Doesn’t Belong: Counter Collections

Which one doesn’t belong?

  1. Group of dots. 4 rows. Row 1, 4. Row 2, 2. Row 3, 4. Row 4, 2.
  2. Array. 3 rows of 4.
  3. Group of dots. 10 yellow.
  4. Group of 12 yellow dots.

Activity 1 What is an Array?

Arrange each set of counters into equal rows with no extra counters.

  1. How many counters are there in all?

    Show how you arranged them using words, drawings, or numbers.

  2. How many counters are there in all?

    Show how you arranged them using words, drawings, or numbers.

  3. How many counters are there in all?

    Show how you arranged them using words, drawings, or numbers.

Activity 2 Rows of Counters

Problem 1

Array. 3 rows of 2.

  1. How many rows are in this array?

  2. How many counters are in each row?

  3. How many counters are there in all?

Problem 2

Array. 2 rows of 4. 4 yellow, 4 red.

  1. How many rows are in this array?

  2. How many counters are in each row?

  3. How many counters are there in all?

Problem 3

Use 6 counters to make 2 rows with the same number in each row. How many counters are in each row?

Problem 4

Use 20 counters to make 4 rows with the same number in each row. How many counters are in each row?

Practice Problem

Problem 1

3 rows of 5 counters

  1. How many counters are in each row?

  2. How many rows are there?

  3. How many counters are there in all?