Big Ideas Math: Modeling Real Life, Grade 8
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Exercise 7 Page 420

What do you get if you calculate the square root?

Integer, rational number

Before we consider the given number, let's recall the various types of numbers.

  • Rational Number: A number is a rational number if it can be written as ab, where a and b are both integers and b≠ 0.
  • Integer: A number is an integer if it is a positive or negative counting number (or zero). All integers are also rational numbers because any number can be written as a division by one, a1.
  • Whole Number: A number is a whole number if it is a non-negative counting number. All whole numbers are also integers and rational numbers.
    • Natural Number: A number is a natural number if it is a positive counting number. All natural numbers are also whole numbers, integers, and rational numbers.
    • Irrational Number: An irrational number is a number that cannot be written in the form of a rational number. These are recognized as being non-repeating, infinite decimals.
    Now, let's try to categorize the given number using these definitions. -sqrt(49) Let's simplify this square root as much as possible.
    -sqrt(49)
    -7
    This is a negative counting number, which we classify as an integer. We know that every integer is a rational number as well.