Question

rational and irrational numbers unit test

Answer 1

Creating a unit test on rational and irrational numbers can help assess students' understanding of these concepts. Below is a sample unit test that includes various types of questions: multiple-choice, short answer, and problem-solving.

### Rational and Irrational Numbers Unit Test

#### Name: _____________________ Date: ________________

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### Section 1: Multiple Choice (2 points each)

1. Which of the following numbers is irrational?
a) 1.75
b) √5
c) -2
d) 0

2. Which of the following is an example of a rational number?
a) π
b) √2
c) 0.333...
d) e

3. What is the sum of the rational numbers 3/4 and 1/2?
a) 5/4
b) 1
c) 1/4
d) 2/3

4. Which of the following statements is true?
a) All integers are irrational.
b) Every rational number can be expressed as a fraction.
c) The decimal expansion of every irrational number repeats.
d) 0 is an irrational number.

5. What type of number is -3.14?
a) Irrational
b) Whole number
c) Natural number
d) Rational

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### Section 2: Short Answer (3 points each)

6. Define a rational number.

7. Give two examples of irrational numbers and explain why they are considered irrational.

8. Explain the difference between finite and repeating decimals and provide one example of each.

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### Section 3: Problem Solving (5 points each)

9. Determine whether the following numbers are rational or irrational:

a) √16
b) 2.71828... (the constant e)
c) -7/3
d) √10

10. Calculate the product of the rational numbers 2/5 and -3/4. Simplify your answer.

### Extra Credit (2 points)

11. Is the number 0.101001000100001... (the decimal representation where the number of zeros between ones increases) rational or irrational? Explain your reasoning.

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### Answer Key

#### Section 1: Multiple Choice
1. b) √5
2. c) 0.333...
3. a) 5/4
4. b) Every rational number can be expressed as a fraction.
5. d) Rational

#### Section 2: Short Answer
6. A rational number is any number that can be expressed as the quotient or fraction of two integers (where the denominator is not zero).
7. Examples: √2 (not a perfect square), π (the ratio of the circumference of a circle to its diameter); both are irrational because they cannot be expressed as a simple fraction.
8. Finite decimals have a limited number of digits (e.g., 0.25), while repeating decimals have a sequence of digits that repeat indefinitely (e.g., 0.333...).

#### Section 3: Problem Solving
9. a) Rational (since √16 = 4 is an integer), b) Irrational (e cannot be expressed as a fraction), c) Rational, d) Irrational (√10 is not a perfect square).
10. -3/10 (product of fractions simplified).

#### Extra Credit
11. Irrational. This decimal does not repeat in a predictable pattern and cannot be expressed as a fraction.

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This test effectively evaluates the understanding of rational and irrational numbers across a range of question formats. Feel free to adjust the questions or scoring as needed!