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# REAL NUMBERS

### Information about the real number sets

What are natural numbers? The counting numbers (1,2,3,4,5 . . . )
What are whole numbers? The set of numbers that contains the natural numbers and 0 (0, 1, 2, 3, 4, 5)
What are integers? The set of numbers that contains the whole numbers and their opposites. ( . . .-2, -1, 0, 1, 2, . . .)
What are rational numbers? Any number that can be made into a fraction - a/b where a and b are integers, b does not = 0
What are irrational numbers? Numbers that cannot be expressed as fractions, such as pi, or square root of 2
Are repeating decimals rational? Yes, because fractions that repeat such as 1/3, are fractions.
Are terminating decimals rational? Yes, because terminating decimals like 0.5 have a fraction equivalent, 1/2 , and fractions are rational.
What is the square root of 9? 3
What is the square root of 25? 5
What is the square root of 49? 7
What is the square root of 100? 10
What is 4 squared? 16
What is the value of 15 squared? 225
What is the formula for the area of a square? A = side x side or A = side squared
Are rational numbers real numbers? Yes - all irrational and rational numbers are considered real numbers
Under the Real Number system, what are some classifications for number sets? Irrational or Rational Natural Whole Integer Rational
Created by: jrussellgchs