# Common Core Grade 8 Math 8-ns-2

Back**The Number System: Know That There Are Numbers That Are Not Rational, And Approximate Them By Rational Numbers.**

Use rational approximations of irrational numbers to compare the size of irrational numbers, locate them approximately on a number line diagram, and estimate the value of expressions (e.g., ?2). For example, by truncating the decimal expansion of ?2, show that ?2 is between 1 and 2, then between 1.4 and 1.5, and explain how to continue on to get better approximations.

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