Month: November 2012

1300 Free K-12 Mathematics Lesson Plans and Activities

High School Mathematics, Resources and Freebies

Happy Thanksgiving day to all my American readers. Today, I share to you more than 1300 lesson plans and activities in K-12 mathematics.  Please do not forget to share to your colleagues.

Affiliate: Math Lesson Plans for Teachers

Lesson Plans

1. NCTM Illuminatons

NCTM Illuminations contains 607 lessons plans and 108 activities ranging from Kindergarten to Grade 12.  The lessons are divided into Numbers and Operations, Algebra, Geometry, Measurement, and Data Analysis and Probability. The site also includes interactive applets. » Read more

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Math Word Problems: Solving Motion Problems Part 3

High School Mathematics

This is the third part of the Motion Word Problem Series, a subseries of the Mathematics Word Problem Solving Series. The first part discusses about the basic concepts of rate, time, and distance. The second part discusses objects traveling in opposite direction and objects traveling toward each other.

Porsche 959

In this post, we discuss about objects traveling on the same direction. » Read more

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Why The Addition Number Trick Works

High School Mathematics, Problem Solving and Proofs

In the Addition Number Trick, my latest post in the Mathematical Palette (sorry, this site is already gone), I shared about a number trick I learned when I was still in the elementary school. The trick involves (1) letting a friend write a number  and then (2) predicting the sum of the five numbers, including the four numbers (3 – 6) that you are about to write in alternate.  The order of writing is indicated by the circled numbers in the figure below.

The Addition Number Trick

To get the sum of the five numbers, subtract 2 from the first number and then affix it to the leftmost part (543 becomes 2541).  Next, your friend and you will write the numbers in alternate, and you should make sure that each digit on the same place value add up to 9 (see detailed instructions). After adding the numbers, the sum should be correct.  » Read more

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