Add or subtract as indicated. Write answers in lowest terms as needed. 7/9-2/9

Key Concepts

Fractions

Fractions represent a part of a whole and consist of a numerator (the top number) and a denominator (the bottom number). Understanding how to manipulate fractions, including addition and subtraction, is essential for solving problems involving them. In this case, both fractions have the same denominator, which simplifies the process.

Common Denominator

A common denominator is a shared multiple of the denominators of two or more fractions, allowing for their addition or subtraction. When fractions have the same denominator, as in the given problem, you can directly subtract the numerators while keeping the denominator unchanged. This concept is crucial for performing operations on fractions efficiently.

Lowest Terms

Writing a fraction in lowest terms means simplifying it to its simplest form, where the numerator and denominator have no common factors other than 1. This is important for clarity and accuracy in mathematical communication. After performing operations on fractions, it is often necessary to reduce the result to lowest terms to ensure it is presented in the most concise way.