Pre-calc notes

# Pre-calc notes - Pre-calc notes Rational Numbers A rational...

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Pre-calc notes: Rational Numbers Irrational Numbers A rational number is one that can be written as a fraction (a ratio) with an integer numerator and an integer denominator other than zero. In set notation, you write The numbers that cannot be written as the ratio of two integers are called the irrational numbers. Examples of irrational numbers are 5.1223344444. .., –3, 101001000. ..., and . The set of rational numbers with the set of irrational numbers forms the set of real numbers R . Operations With Like Signs With Unlike Signs Addition and Subtraction To find the sum of two numbers with the same sign, add their absolute values. The sum has the same sign as the given numbers. For example, 20 + 4 = 24. Note that a b = a + (– b ). That is, subtraction of two numbers can also be seen as addition. For example, 10 – 4 = 6. To find the sum of two numbers with the unlike signs, subtract their absolute values. The answer is positive if the number with the

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Pre-calc notes - Pre-calc notes Rational Numbers A rational...

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