November 2, 2015
|
by Yolanda Swain

Lesson plan

Up, Up, and Array

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

(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.
(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.
(10 minutes)
  • Draw other arrays on the board, and have students use counters to practice solving and writing addition sentences for each array.
(10 minutes)
  • Have students complete the Array Practice worksheet on their own.
  • 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.
(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.
(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.

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