section 1-1 and 1-2

# B opposite signs subtract the larger from the smaller

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b. Opposite Signs: subtract the larger from the smaller and keep the larger’s sign. 2.Multiplication and Division: a. Two positives = positive b. Two negatives = positive c. One positive and One negative = negative 3.Squaring a negative number = positive number 4.Fractions: a. Addition and Subtraction: need a common denominator. b. Multiplication and Division: do NOT need a common denominator 5.Variables: a. Addition and Subtraction: need like terms b. Multiplication and Division: do not need like terms x + x = 2 x x ( x ) = x 2

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3. x + 3( y + x ) y [ ] 4. 3 s ( v + 5 s ) 2 v 5. 12 52 2 2 ( ) 6 2 3 Classifying Numbers: Real Numbers (R): all the numbers that you use in everyday life Rational Numbers (Q): can be expressed as a ratio. The decimal form of a rational number is either a terminating or repeating decimal. Irrational Numbers (I): The decimal form neither terminates nor repeats. Integers (Z): A rational number with the denominator equal to 1. Can be positive or negative. Whole Numbers (W) : all positive integers and zero Natural Numbers (N) : all positive integers. They are also called counting numbers. R I Q Z W N
Name the sets of numbers to which each number belongs. 6. 144 7. -185 8. 9.999…. 9. 20 10. 2 3 11. 0
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