### Lesson plan

# Up, Up, and Array

#### Learning Objectives

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

The adjustment to the whole group lesson is a modification to differentiate for children who are English learners.

#### Introduction

*(5 minutes)*

- Give each student 25 counters.
- Ask your students to make eight groups with three 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 five-by-five 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 four rows and five 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 five rows and four 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 practise

*(10 minutes)*

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

#### Independent working time

*(10 minutes)*

- Have students complete the Array practise worksheet on their own.

#### 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.

#### 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.