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K-5 Grade 2 Unit 8 Lesson 7

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•K-5 Math 6-8 Math 9-12 Math

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Lesson 7

Warm-up Activity 1 Activity 2

Unit 8, Lesson 7

What Is an Array?

Grade 2

Warm-up

Which 3 go together?

Group of circles. 3 rows of 3 circles. Column 1, 4. Column 2, 2. Column 3, 3. Column 4, 2. Column 5, 1. — A

Array. 3 rows of 4. — B

Group of circles. 3 columns of 3 circles. Row 1, 1. Row 2, 2. Row 3, 3. Row 4, 2. Row 5, 1. — C

3 rows of 3 circles. Large space between Column 1 and Column 2. Circles in Column 2 overlap with circles in Column 3. — D

Activity 1

Arrange each set of counters into equal-size rows with no leftovers.

How many counters are there in all? _____
Show or explain how you arranged them using drawings, numbers, or words.
How many counters are there in all? _____
Show or explain how you arranged them using drawings, numbers, or words.
How many counters are there in all? _____
Show or explain how you arranged them using drawings, numbers, or words.

Activity 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?
1. How many rows are in this array?
2. How many counters are in each row?
3. How many counters are there in all?
Use 6 counters. Make 2 rows with the same number in each row. How many counters are in each row?
Use 20 counters. Make 4 rows with the same number in each row. How many counters are in each row?