Questions and Answers
All whole numbers are also natural numbers.
False
The number $\sqrt{3}$ is an irrational number.
True
The number 17 is a prime number.
True
Any number raised to the power of 0 equals 1.
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The sum of two even numbers is always an odd number.
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All rational numbers can be expressed as a decimal that terminates.
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Study Notes
Numbers
Classification of Numbers
- Natural Numbers: Positive integers, starting from 1 (1, 2, 3, ...)
- Whole Numbers: Non-negative integers, including 0 (0, 1, 2, 3, ...)
- Integers: Positive, negative, and zero (..., -3, -2, -1, 0, 1, 2, 3, ...)
- Rational Numbers: Fractions, can be expressed as p/q, where p and q are integers (e.g., 3/4, 22/7)
- Irrational Numbers: Cannot be expressed as a finite decimal or fraction (e.g., π, e, sqrt(2))
- Real Numbers: Includes rational and irrational numbers
- Complex Numbers: Numbers with both real and imaginary parts (e.g., 3 + 4i, where i is the imaginary unit)
Properties of Numbers
- Even Numbers: Divisible by 2, always end in 0, 2, 4, 6, or 8
- Odd Numbers: Not divisible by 2, always end in 1, 3, 5, 7, or 9
- Prime Numbers: Only divisible by 1 and themselves (e.g., 2, 3, 5, 7, 11, ...)
- Composite Numbers: Can be divided by other numbers besides 1 and themselves (e.g., 4, 6, 8, 9, ...)
Operations with Numbers
- Addition: Combining two or more numbers to get a total or a sum
- Subtraction: Finding the difference between two or more numbers
- Multiplication: Repeating a number a certain number of times to get a product
- Division: Sharing a number into equal parts or groups
- Exponents: Raising a number to a power to get a result (e.g., 2^3 = 8)
Classification of Numbers
- Natural numbers are a set of positive integers starting from 1.
- Whole numbers are non-negative integers, including 0.
- Integers are a combination of positive, negative, and zero numbers.
- Rational numbers are fractions that can be expressed as p/q, where p and q are integers.
- Irrational numbers cannot be expressed as a finite decimal or fraction and have non-repeating digits.
- Real numbers include both rational and irrational numbers.
- Complex numbers are numbers with both real and imaginary parts.
Properties of Numbers
- Even numbers are divisible by 2 and always end in 0, 2, 4, 6, or 8.
- Odd numbers are not divisible by 2 and always end in 1, 3, 5, 7, or 9.
- Prime numbers are only divisible by 1 and themselves, with the exception of 0 and 1.
- Composite numbers can be divided by other numbers besides 1 and themselves.
Operations with Numbers
- Addition is the process of combining two or more numbers to get a total or a sum.
- Subtraction is the process of finding the difference between two or more numbers.
- Multiplication is the process of repeating a number a certain number of times to get a product.
- Division is the process of sharing a number into equal parts or groups.
- Exponents involve raising a number to a power to get a result, denoted by a superscript.
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Description
This quiz covers the classification of numbers, including natural numbers, whole numbers, integers, rational numbers, irrational numbers, and real numbers.
