# ALEX Lesson Plan

## Roll an Array

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This lesson provided by:
 Author: Summer Payne System: Mobile County School: Pearl Haskew Elementary The event this resource created for: CCRS General Lesson Information
 Lesson Plan ID: 33014 Title: Roll an Array Overview/Annotation: This lesson presents a hands-on partner activity to introduce second graders to making rectangular arrays. Students will use number dice to roll numbers and then build the coordinating array. An equation will be written to show the sum of the equal addends.This is a College- and Career-Ready Standards showcase lesson plan.
Associated Standards and Objectives
Content Standard(s):
 Mathematics MA2019 (2019) Grade: 2 4. Using concrete and pictorial representations and repeated addition, determine the total number of objects in a rectangular array with up to 5 rows and up to 5 columns. a. Write an equation to express the total number of objects in a rectangular array with up to 5 rows and up to 5 columns as a sum of equal addends. Unpacked Content Evidence Of Student Attainment:Students: use rectangular arrays to determine the total number of objects. use repeated addition to determine the total number of objects. write equations expressing the total number of objects with repeated addition. Teacher Vocabulary:Rectangular array Rows ColumnsKnowledge:Students know: how to use arrays and repeated addition as multiplication strategies.Skills:Students are able to: represent the total number of objects in a rectangular array as the sum of repeated addition. choose and apply addition strategies to accurately compute sums for multiple addend problems.Understanding:Students understand that: repeated addition determines the total number of items in a rectangular array.Diverse Learning Needs: Essential Skills:Learning Objectives: M.2.4.1: Distinguish between rows and columns. M.2.4.2: Use repeated addition to solve problems with multiple addends. M.2.4.3: Count forward in multiples from a given number. Examples: 3, 6, 9, 12; 4, 8, 12, 16. M.2.4.4: Recall doubles addition facts. M.2.4.5: Model written method for composing equations. Prior Knowledge Skills:Give two sets of objects repeatedly from a larger group to represent multiples. Establish one-to-one correspondence between numbers and objects. Identify the = sign as equal. Pair same and equal. Know same when comparing numbers of objects. Recognize cue words for plus (add, plus, combine). Identify the + sign as plus. Use manipulatives and counting, recognize and represent the number 20 as two sets of ten. Use manipulatives and counting, recognize and represent the numbers 1 through 40. Establish one-to-one correspondence between numbers and objects. Rote count to forty. Alabama Alternate Achievement Standards AAS Standard: M.AAS.2.4 Use repeated addition to find the sum of objects arranged in equal groups up to 10.

Local/National Standards:

Primary Learning Objective(s):

The students will understand that equal addends can be arranged into rectangular arrays and can be used to find the sum. The students will build arrays using manipulatives and write an equation to express the sum.