National Security Agency
Backyard Building - Area and Perimeter
Turn young mathematicians into landscape architects with this four-lesson series on area and perimeter. Beginning with a basic introduction to calculating perimeter and area using non-standard units of measurement, this instructional...
Curated OER
Area and Perimeter of Rectangles
Discover the difference between area and perimeter. Learners are grouped in twos and threes and each group has one advanced/gifted learner to serve as the peer helper. They receive manipulatives to help them determine the area and...
Curated OER
Perimeter All Around
Learners explore perimeter and area of regular and irregular polygons. They experiment with color squares and create different arrangements using the same number squares. Then they compare the area and perimeter measurements of each.
Curated OER
Measurement: Perimeter and Area
In this perimeter and area lesson, students learn the formulas for perimeter and area and view model problems using tiles. Students work in groups to solve practice problems. Students define perimeter and area and explain why it is...
Exploratorium
Exploring Tessellations
Tessellations are patterns of repeating shapes that don't overlap and don't have any gaps. Middle schoolers take this simple definition and engage in a lesson that combines visual art and mathematics. They cut out index cards using...
Curated OER
Algebra...Your Second Language
Help learners translate word problems into algebraic equations. They will rewrite words using symbols and evaluate algebraic expressions using real life scenarios, animation sequences, video presentations, and activities to help learners...
Curated OER
Disappearing Magic Factors
Students identify, through the number of rows and columns, the factors related to the product. In turn, they also discover how to find the missing factor, which is part of the fact family for that product.