8th grade
number system
STANDARDS
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ESSENTIAL QUESTIONS
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CC.8.NS.1.Understand informally that evey number has a decimal expansion; the rational numbers are those with decimal expansions that terminate in 0's or eventually repeat. Know that other numbers are call irrational.
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What does it mean for a number to be rational or irrational?
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CC.8.NS.2 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., π2). 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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Where are irrational numbers located on a number line? How can a number line help compare the size of numbers?
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