Lesson Plan:

# Up, Up, and Array

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Subject
Standards
November 2, 2015

## Learning Objectives

Students will be able to describe an array using repeated addition.

## Lesson

### Introduction (5 minutes)

• Give each student 25 counters.
• Ask your students to make 8 groups with 3 counters in each group.
• Direct your students to count by threes.
• Ask them to identify how many counters there are altogether.
• Write an equation to show this. For example: 3 + 3 + 3 + 3 + 3 + 3 + 3 + 3.
• Tell students that today they are going to describe an array, or an ordered display, using number sentences.

### Explicit Instruction/Teacher Modeling (10 minutes)

• Draw a 5-by-5 array on the board.
• Read aloud the following problem: Maria has 4 treat bags with 5 cookies in each bag. How many cookies are there in all?
• Model the problem by shading in 4 rows and 5 columns on the board.
• Ask students what strategy they could use to find the total number of cookies.
• Ask students if the answer would change if the numbers were turned around (if there were 5 rows and 4 columns). Explain that this does not change the answer.
• Give students a problem such as: Tiki has 4 rows of cars with 2 cars in each row. How many cars are there?
• Model the problem on the board by drawing it out.
• Use repeated addition to write a number sentence.

### Guided Practice/Interactive Modeling (10 minutes)

• Draw other arrays on the board, and have students use counters to practice solving and writing addition sentences for each array.

### Independent Working Time (10 minutes)

• Have students complete the Array Practice worksheet on their own.

## Extend

### Differentiation

• Enrichment: Give advanced students 35 counters. Have them create as many different arrays as they can with all 35 counters. Then, have them write number sentences for each array.
• Support: Give students manipulatives to complete their arrays.

## Review

### Assessment (5 minutes)

• Have students answer the following problem: There are 4 rows of chairs with 6 chairs in each row. How many chairs are there in all?
• Circulate and observe students as they work.

### Review and Closing (5 minutes)

• Ask a volunteer what an array is.
• Have students provide real-life examples of arrays, such as bookshelves and egg cartons.
• Watch the Real Life Arrays video.