01:640:111 Study Guide - Midterm Guide: Real Number, Natural Number, Empty Set
30 Dec 2019
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Rational numbers: a bar above the last number(s) means a number is rational. Irrational numbers: when a number doesn"t repeat it is irrational. If we stop the number at any decimal, we get an approximation. When we multiply two numbers, order doesn"t matter. doesn"t matter. When we add three numbers, it doesn"t matter the two we add first. When we multiply three numbers, it doesn"t matter which two we multiply first. When we multiply a number by the sum of two numbers, we get the same result as we do if we multiply the number by each term and then add the result. We choose a reference point o , called the origin, which corresponds to the real number. The number associated with point p is called the coordinate of p, and the line is called a coordinate line, or a real number line, or a real line.
