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Page 152 #19-38 ANSWERS

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**Student Learning Goal Chart**

Lesson Reflections 3-10 LAST ONE!

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**Pre-Algebra Learning Goal Students will understand rational and real numbers.**

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**Learn to determine if a number is rational or irrational (3-10)**

Students will understand rational and real numbers by being able to do the following: Learn to write rational numbers in equivalent forms (3.1) Learn to add and subtract decimals and rational numbers with like denominators (3.2) Learn to add and subtract fractions with unlike denominators (3.5) Learn to multiply fractions, decimals, and mixed numbers (3.3) Learn to divide fractions and decimals (3.4) Learn to solve equations with rational numbers (3.6) Learn to solve inequalities with rational numbers (3-7) Learn to find square roots (3-8) Learn to estimate square roots to a given number of decimal places and solve problems using square roots (3-9) Learn to determine if a number is rational or irrational (3-10)

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**Today’s Learning Goal Assignment**

Learn to determine if a number is rational or irrational.

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Pre-Algebra HW Page 169 #1-40 all

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**3-10 Warm Up Problem of the Day Lesson Presentation The Real Numbers**

Pre-Algebra

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**3-10 Warm Up The Real Numbers**

Pre-Algebra 3-10 The Real Numbers Warm Up Each square root is between two integers. Name the two integers. Use a calculator to find each value Round to the nearest tenth. 10 and 11 2. – 15 –4 and –3 1.4 4. – 123 –11.1

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Problem of the Day The circumference of a circle is approximately 3.14 times its diameter. A circular path 1 meter wide has an inner diameter of 100 meters. How much farther is it around the outer edge of the path than the inner edge? 6.28 m

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**Today’s Learning Goal Assignment**

Learn to determine if a number is rational or irrational.

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Vocabulary irrational number real number Density Property

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**Biologists classify animals based on shared characteristics**

Biologists classify animals based on shared characteristics. The gray lesser mouse lemur is an animal, a mammal, a primate, and a lemur. You already know that some numbers can be classified as whole numbers,integers, or rational numbers. The number 2 is a whole number, an integer, and a rational number. It is also a real number. Animals Mammals Primates Lemurs

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**Recall that rational numbers can be written as fractions**

Recall that rational numbers can be written as fractions. Rational numbers can also be written as decimals that either terminate or repeat. 4 5 23 3 = 3.8 = 0.6 1.44 = 1.2

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Irrational numbers can only be written as decimals that do not terminate or repeat. If a whole number is not a perfect square, then its square root is an irrational number. 2 ≈ … A repeating decimal may not appear to repeat on a calculator, because calculators show a finite number of digits. Helpful Hint

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**The set of real numbers consists of the set of rational numbers and the set of irrational numbers.**

Integers Whole numbers

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**Additional Examples 1: Classifying Real Numbers**

Write all names that apply to each number. A. 5 5 is a whole number that is not a perfect square. irrational, real B. –12.75 –12.75 is a terminating decimal. rational, real 16 2 = = 2 4 2 16 2 C. whole, integer, rational, real

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**Write all names that apply to each number.**

Try This: Example 1 Write all names that apply to each number. A. 9 9 = 3 whole, integer, rational, real B. –35.9 –35.9 is a terminating decimal. rational, real 81 3 = = 3 9 3 81 3 C. whole, integer, rational, real

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**Additional Examples 2: Determining the Classification of All Numbers**

State if the number is rational, irrational, or not a real number. A. 15 15 is a whole number that is not a perfect square. irrational 0 3 0 3 = 0 B. rational

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**Additional Examples 2: Determining the Classification of All Numbers**

State if the number is rational, irrational, or not a real number. C. –9 not a real number 4 9 2 3 = 4 9 D. rational

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**State if the number is rational, irrational, or not a real number.**

Try This: Examples 2 State if the number is rational, irrational, or not a real number. A. 23 23 is a whole number that is not a perfect square. irrational 9 0 B. not a number, so not a real number

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**State if the number is rational, irrational, or not a real number.**

Try This: Examples 2 State if the number is rational, irrational, or not a real number. C. –7 not a real number 64 81 8 9 = 64 81 D. rational

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The Density Property of real numbers states that between any two real numbers is another real number. This property is also true for rational numbers, but not for whole numbers or integers. For instance, there is no integer between –2 and –3.

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**Additional Examples 3: Applying the Density Property of Real Numbers**

Find a real number between and 3 5 2 5 There are many solutions. One solution is halfway between the two numbers. To find it, add the numbers and divide by 2. 2 5 ÷ 2 3 5 5 5 = ÷ 2 1 2 = 7 ÷ 2 = 3 3 1 5 2 5 4 3 5 4 5 3 1 2 A real number between and is 3 . 3 5 2 5 1 2

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**Find a real number between 4 and 4 . 4 7 3 7**

Try This: Example 3 Find a real number between and 4 7 3 7 There are many solutions. One solution is halfway between the two numbers. To find it, add the numbers and divide by 2. 3 7 ÷ 2 4 7 7 7 = ÷ 2 1 2 = 9 ÷ 2 = 4 4 2 7 3 7 4 7 5 7 1 7 6 7 4 1 2 A real number between and is 4 7 3 7 1 2

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**1. 2. – 3. 4. 5. Find a real number between –2 and –2 .**

Lesson Quiz Write all names that apply to each number. 1. 2 2. – 16 2 real, irrational real, integer, rational State if the number is rational, irrational, or not a real number. 3. 25 0 4. 4 • 9 not a real number rational 5. Find a real number between –2 and –2 . 3 8 3 4 Possible answer –2 . 5 8

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