Sunday, May 3, 2015

Common Core Math 8 Activity - Perfect Squares and Irrational Numbers on Geoboards

After reviewing perfect squares and their areas and perimeters, we will be using geoboards and rubber bands to find other squares and their irrational side lengths.

We will also learn a technique for estimating irrational numbers as mixed numbers and decimals without using calculators. Calculators may be used to verify estimations and approximations.


If you were absent pay close attention to the bottom right where we approximate the square root of 14 as a decimal rounded to the nearest tenth.

A wealth of information can be found at https://www.mathsisfun.com/irrational-numbers.html

This lesson idea was adopted from NCTM's web site http://illuminations.nctm.org/Lesson.aspx?id=3096.

This video explains how to approximate irrational numbers on a number line, we will go into a little more detail. https://www.youtube.com/watch?v=6htWeCE2wro

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