Integer

Definition

An integer is a whole number that can be positive, negative, or zero, without any fractional or decimal component. Integers are fundamental in mathematics, especially in operations involving addition, subtraction, multiplication, and division. They serve as the building blocks for number systems and are crucial in understanding more complex concepts like rational and irrational numbers.

5 Must Know Facts For Your Next Test

1. Integers include positive numbers, negative numbers, and zero, making them a comprehensive set of whole numbers.
2. When multiplying two integers, the product is always an integer, which highlights their closure property under multiplication.
3. The set of integers is denoted by the symbol ℤ, which comes from the German word 'Zahlen' meaning 'numbers.'
4. Integers are used in various mathematical operations like addition, subtraction, and multiplication, and have specific rules such as the commutative and associative properties.
5. In real-world applications, integers are often used to represent counts, measurements without fractions, and temperature scales above and below zero.

Review Questions

• How do integers function within mathematical operations like multiplication and addition?
  • Integers are essential for performing mathematical operations such as multiplication and addition because they maintain their properties throughout these processes. For example, when adding two integers, the result is always another integer due to the closure property. Similarly, multiplying two integers yields another integer, which is crucial for various applications in mathematics and real-life scenarios.
• Discuss the significance of integers in the broader context of number systems and their properties.
  • Integers play a vital role in the broader context of number systems as they serve as the foundation for both rational and irrational numbers. They help define the structure of arithmetic by establishing rules and properties such as closure under addition and multiplication. Understanding integers allows mathematicians to build upon these concepts to explore more complex ideas in algebra and calculus.
• Evaluate how the understanding of integers contributes to solving real-world problems involving measurements and counts.
  • The understanding of integers is critical for solving real-world problems because many situations involve counting items or measuring temperatures. Integers provide a clear framework for these problems since they can represent both positive values (like counts) and negative values (like temperatures below zero). By mastering integers, individuals can effectively analyze data, make calculations in various fields such as finance or science, and develop logical reasoning skills essential for everyday decision-making.

Related terms

Whole Number: A whole number is a non-negative integer, including zero, that does not have any decimal or fractional part.

Rational Number: A rational number is any number that can be expressed as a fraction of two integers, where the denominator is not zero.

Absolute Value: The absolute value of an integer is the distance of that number from zero on the number line, regardless of direction.