ALEX | Alabama Learning Exchange

Finding the Area of a Rectangle: Unit Squares and Multiplying Side-Lengths

Classroom Resource Information

Title:

Finding the Area of a Rectangle: Unit Squares and Multiplying Side-Lengths

URL:

https://aptv.pbslearningmedia.org/resource/drg2vco8lp0/rectangle-area-as-product-of-dimensions-same-as-counting-unit-squares-khan-drg2vco8lp0/

Content Source:

PBS

Type:

Learning Activity

Overview:

The area of a rectangle can be found by using unit squares and by multiplying side-lengths. This activity with videos and practice problems will show third-grade students how to think of area in terms of covering an object with square tiles and by multilpying the dimensions.

Content Standard(s):

Mathematics
MA2019 (2019)
Grade: 3

21. Count unit squares (square cm, square m, square in, square ft, and improvised or non-standard units) to determine area.

Unpacked Content

Evidence Of Student Attainment:

Students:

Accurately measure area by counting standard unit squares (square cm, square m, square in, and square ft) and non-standard unit squares (e.g., orange pattern blocks or floor tiles).

Teacher Vocabulary:

Unit square
Length
Plane figure
Square cm
Square m
Square in
Square ft
Improvised
Non-standard unit

Knowledge:

Students know:

area is a measurable attribute of two-dimensional figures.

Skills:

Students are able to:

Determine area of a rectangle by counting unit squares.

Understanding:

Students understand that:

A unit square is a square with a side length of 1 unit, and that such a square represents a unit of measurement.
The area of a plane figure is measured by counting the number of same-size squares (unit squares) that exactly cover the interior space of the figure.

Diverse Learning Needs:

Essential Skills:

Learning Objectives:
M.3.21.1: Recognize that unit squares are equal.
M.3.21.2: Define the units of measurement (cm, m, in, ft).
M.3.21.3: Express the length of an object as a whole number of length units by laying multiple copies of a shorter object (the length unit) end to end; understand that the length measurement of an object is the number of same-size length units that span it with no gaps or overlaps.

Prior Knowledge Skills:

Identify units of measurement for length.
Order three objects by length.
Compare the lengths of two objects indirectly by using a third object.

Alabama Alternate Achievement Standards

AAS Standard:
M.AAS.3.20 Find the area of a given shape using arrays (unit cubes and tiles) in relationship to multiplication. Limit units to 25.

Tags:

area, multiplication, rectangle, unit squares

License Type:

Custom Permission Type
See Terms: https://www.pbslearningmedia.org/help/terms-of-use/#restrictions
For full descriptions of license types and a guide to usage, visit :
https://creativecommons.org/licenses

Partnered Event:

ALEX Resource Development Summit

Accessibility

Comments

2019 ALCOS

21. Count unit squares (square cm, square m, square in, square ft, and improvised or non-standard units) to determine area.

This resource provided by:

Author:	Michelle Frye
The event this resource created for:	ALEX Resource Development Summit

ALEX Classroom Resource

Finding the Area of a Rectangle: Unit Squares and Multiplying Side-Lengths