Math OER

Welcome to mathoer.net, a fun website stuffed full of resources to help you enjoy math.

Here is an insightful table of contents that will be explained below:

	Changing a Single Number	Simplifying an Expression	Solving an Equation
Number Sense	What is Math? Place Value and Rounding Estimating	Two Models for Division Divisibility and Factors Variables and Negatives	Linear Patterns Area Patterns
Fraction Format	Kitchen Fractions Desired Denominators Fractions and Decimals	Fraction × and ÷ Fraction + and − Mixed Number Subtraction Order and Terms	One Step Equations Two Step Equations Isolating a Variable Pythagorean Theorem
Percent Format	Decimal Point Scoots Four Replacements for % Percents, Decimals, and Fractions	Percent Of Percent Change The One Plus Trick	Percent Sentences Percent Word Problems
Ratio	Ratios and Rates Unit Rates Rates with Variables	Goeswith Chains Unit Analysis Sin, Cos, and Tan	Checking Proportions Proportions with Variables Scale Factors Variation, Gasses, and Gears
Probability	Fair Spinner Games	Probability vs. Odds Outcomes vs. Events With vs. Without Replacement	Types of Arrangements Probability Arithmetic
Measurement	Units and Their History One Step Conversions Shortcut for SI Prefixes Exponents and Square Roots	Polygon Perimeter and Area Metaphorical Rectangles Circle Circumference and Area Ellipse Area	Temperature Area Puzzles Prisms
Using Data	Frequency Tables and Bar Charts Types of Categories Histograms Scientific Notation	Words About Averages Bell Curves, Natural and Unnatural Counted vs. Relative Frequency Contingency Tables Pie Charts	Types of Change Weighted Average

Most foundational math classes and textbooks only organize topics by the left-hand column. This is nice, but does not add much value. It is already quite obvious when looking at a chapter if it deals with fractions, percentages, measurement, and so on.

So this website also organizes topics by the other columns.

A page nicknamed shapeshifting looks at ways to change a single number.

A page nicknamed mad science looks at squashing together the parts of an expression.

A page nicknamed justice looks at doing the same thing to both sides of an equation.

Have you ever seen someone try to cross-multiply when doing fraction arithmetic? What happened was that they saw two fractions next to each other and tried to use a technique for an equation in a situation that only had an expression. Our more complete topic organization helps prevent this type of mistake.

With this website you can also learn about real-life applications!

There is also fun and useful stuff to explore!

Have fun exploring the website! Remember to use Ctrl-F to search for text, and your browser shortcut that jumps to the top of the page.

Students may want to use the nice Desmos scientific calculator, which is also available as a phone app.

If you are an LCC student, you might also want to look at my LCC Resources or achievements pages, or visit my Zoom room or gigantic online whiteboard.

OER Details

The acronym OER at the end of Math OER stands for Open Educational Resources. Different OER materials have different rules for how they may be shared, copied, or modified.

I am slightly protective of my explanations of math concepts. These explanations are written for a specific audience. It is easy for a paraphrase to unknowingly explain math concepts badly. In some places my written explanations unexplicitly take into consideration my accompanying lecture style. For those reasons, I ask that other educators please contact me before modifying my math concept explanations. However, you may share or copy my math concept explanations verbatim as much as you wish if you provide attribution with a mention of this website.

This website uses some public domain images. For example, the this page has images of a Lego minifig.

Everything else (all my diagrams, math problems, study tips, etc.) uses the Creative Commons Attribution-NonCommercial-ShareAlike license. This means you cannot use my work to earn money, but otherwise you may share, copy, or modify that stuff without asking permission if you provide attribution with a mention of this website.

I am always excited to hear by e-mail how my work is helping other educators!