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# Course 3, Lesson 31, Adding Integers/Collecting Like Terms

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Author: Hector Soto
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1. Model with mathematics. 2. Know that numbers that are not rational are called irrational. Understand informally that every number has a decimal expansion; for rational numbers show that the decimal expansion repeats eventually, and convert a decimal expansion which repeats eventually into a rational number. 3. 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). 4. Know and apply the properties of integer exponents to generate equivalent numerical expressions. 5. Use numbers expressed in the form of a single digit times an integer power of 10 to estimate very large or very small quantities, and to express how many times as much one is than the other.

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## Adding Integers and Collecting Like Terms

Source: materdeitopeka