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# Category: Algebra

## Scale of the Universe

One of my former students (who is still a Twitter user) pointed me to this fantastic animation of powers of 10 meters, called “Scale of the Universe 2.”  I think you’ll appreciate the design and relevance of the objects the authors, Cary and Michael Huang, use to help the user to understand the relevance of scale.  Just like Powers of 10, you can zoom from the smallest part of a cell to the edges of the universe.     The authors have a collection of science- and math-oriented animations at HTwins.net that might be worth checking out too.  They also have...

## Collection of Math Games

To view the collections of Math Games, hover over the Games Menu, and go to one of the dropdown categories.   Possibly Related Posts: Bringing the Real World to Your Math Class Every Day Taking the Algebra Out of College Algebra Group Exploration in Math Learning at Scale Slides from ICTCM AMATYC Keynote Notes: Challenge and...

## Signed Numbers: Colored Counters in a “Sea of Zeros”

The “colored counter” method is an old tried-and-true method for teaching the concept of adding signed numbers.  However, to show subtraction with the colored counter method has always seemed painful to me … that is, until I altered the method slightly. Now all problems are demonstrated within a “Sea of Zeros” and when you need to take away counters, you can simply borrow from the infinite sea.  Voila!  Here’s a short video to demonstrate addition and subtraction of integers using the “Sea of Zeros” method.  You can print some Colored Counter Paper here. Video: Colored Counters in a Sea...

## Battling Bad Science (and Statistics)

If you ever needed a REASON to calculate the highest point of a parabola that opens downward, here’s one. Possibly Related Posts: Bringing the Real World to Your Math Class Every Day Taking the Algebra Out of College Algebra Group Exploration in Math Elaborations for Creative Thinking in STEM Learning Math is Not a Spectator...

## Exponent Block and Factor Pair Block

A few weeks ago I built two new games for algebra in one week.  These games just use the game mechanic from “Antiderivative Block” (a Calculus game), but with algebra-oriented game cards.  The game mechanic is a classic “get 4-in-a-row” so it’s pretty easy to learn. Exponent Block (plus Gameboard) will help students contrast slightly different expressions involving exponent rules, especially negative and zero exponents. Factor Pair Block (plus Gameboard) will help prepare students for a unit on factoring.  There are two sets of playing cards (print each set on a different color of paper if you want to...