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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.
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.
Additional Learning Objective(s):
31 to 60 Minutes
Materials and Resources:
Connecting cubes or counters, grid paper (attached), recording sheet (attached), slideshow presentation (attached)
Technology Resources Needed:
Interactive whiteboard or digital projector
A Smart notebook file is included for use with an interactive whiteboard. If you do not have access to an interactive whiteboard, it can be presented as a slideshow.
The teacher will question throughout the lesson using the following questions: Which picture is easier to count? Why? What are some things that come in arrays? Is there a different way to arrange the array? How many cubes are there altogether? How do you know?
The final task can be used for the teacher to assess the level of understanding of the student. A checklist is attached for the teacher to use to decide future activities based on individual student performance.
If a student could not complete the task, give him/her a lower number to build an array. Before having him try again, review the beginning of the slideshow with the student. Go back to the list of real world items that we see in arrays. See if the student can think of anymore on his/her own. Use the Internet to research products that come in arrays.
Each area below is a direct link to general teaching strategies/classroom
for students with identified learning and/or behavior problems such as: reading
or math performance below grade level; test or classroom assignments/quizzes at
a failing level; failure to complete assignments independently; difficulty with
short-term memory, abstract concepts, staying on task, or following directions;
poor peer interaction or temper tantrums, and other learning or behavior problems.