Curated OER
The Formation of Soil
Middle schoolers identify the different components that make up soil. For this earth science lesson, students create a pamphlet for next year's class. They analyze how erosion and weathering shape the Earth.
Curated OER
Conceived in Light
Students write a piece of free-verse poetry that incorporates or focuses on an idea about light. They brainstorm twenty phrases about light as a pre-writing activity.
Curated OER
States of Matter: Liquid
Students work in a mini lab where they measure the temperature every 30 seconds for several minutes as water is heated. They are asked what makes liquid different from a solid. Students view a PowerPoint on the model of liquids,...
Curated OER
Translations
Students explore the concept of translations. In this translations lesson, students discuss similarities and differences between images and pre-images. Students apply translations to coordinates of figures. Students use patty paper to...
Curated OER
Butterfly Camouflage
Fifth graders discuss camouflage and warnings by butterflies as a class. Students design and color their own butterflies that they are to place somewhere in the classroom. Students explain why their butterfly is colored the way that it...
Oswego City School District
Regents Exam Prep Center: Closure Property
This site gives a very clear discussion on the topic of closure of sets over an operation with many examples.
Cuemath
Cuemath: Real Numbers
A comprehensive guide for learning all about real numbers and their important properties with solved examples and practice questions.
Cuemath
Cuemath: Natural Numbers
We see numbers everywhere around us - measuring the temperature, counting money, telling the time, etc. The numbers that are used for counting objects are called "natural numbers". This article explains the properties of natural numbers...
National Council of Teachers of Mathematics
The Math Forum: Ask Dr. Math: Faq: Closure
This site explains closure and has a link to a response from Dr. math regarding this topic. The site explains why the real numbers are closed under the operation of multiplication. The site gives an example of an operation which the real...
Math2
Math2.org: Basic Algebraic Identities
The basic identities and properties of addition and multiplication are listed. No explanation, simply the identities.
Texas Instruments
Texas Instruments: Numb3 Rs: A Group of Symmetries
Based off of the hit television show NUMB3RS, this lesson has students examine a set of transformations to determine if certain properties (such as associativity and closure) exist for equilateral triangles. Students create tables of...
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