Formulas: Area of a Rectangle

Learning Resource Type

Classroom Resource

Subject Area

Mathematics

Grade(s)

3, 4

Overview

This video explains how to calculate area. Area is the measure of the surface inside a flat figure. Area is measured in square units. Multiply the length times the width to get the square units.

Mathematics (2019) Grade(s): 3

MA19.3.20

Find the area of a rectangle with whole number side lengths by tiling without gaps or overlays and counting unit squares.

UP:MA19.3.20

Vocabulary

  • Area
  • Rectangle
  • Tiling
  • Gap
  • Overlay
  • Unit square

Knowledge

Students know:
  • area is a measurable attribute of two-dimensional figures.

Skills

Students are able to:
  • Find the area of a rectangle by tiling it without gaps or overlaps.
  • Measure the area of a rectangle by counting the number of unit squares needed to cover the shape.

Understanding

Students understand that:
  • Area is the number of unit squares needed to cover a surface.
  • Multiple unit squares can be combined to measure the area of rectangles so long as the unit squares completely cover the figure without overlapping each other or extending beyond the edge of the figure.
Mathematics (2019) Grade(s): 4

MA19.4.23

Apply area and perimeter formulas for rectangles in real-world and mathematical situations.

UP:MA19.4.23

Vocabulary

  • Area
  • Perimeter
  • Formula
  • Equation
  • Dimension
  • Length
  • Width

Knowledge

Students know:
  • The relationship of area to the operations of multiplication and addition.
  • The relationship of three whole numbers in a multiplication or division equation.
  • How to distinguish between linear and area measures.

Skills

Students are able to:
  • Apply area formula for rectangles given real-world situations.
  • Apply perimeter formula for rectangles given real-world situations.

Understanding

Students understand that:
Given real-world situations involving rectangles,
  • Area formula represents the region inside a rectangle and is used to calculate area, or calculate one missing dimension if one side length is known.
  • Perimeter formula represents the distance around the rectangle and is used to calculate the perimeter, or calculate one missing dimension if one side length is known.

CR Resource Type

Informational Material

Resource Provider

PBS

License Type

PD
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