Using Order of Operations
Apply order of operations (PEMDAS) in Grade 9 algebra. Evaluate numerical and algebraic expressions by sequencing parentheses, exponents, multiplication, division, addition, and subtraction.
Key Concepts
New Concept Welcome to Algebra! Our journey starts with its most foundational principle: the order of operations , which is a set of rules for simplifying expressions. What’s next This lesson builds your foundation. Soon, you'll see these rules in worked examples involving parentheses, exponents, and even comparing expressions.
Common Questions
What is PEMDAS and how do you use it?
PEMDAS stands for Parentheses, Exponents, Multiplication/Division (left to right), Addition/Subtraction (left to right). Follow this order to evaluate any expression correctly.
Do multiplication and division have equal priority?
Yes. Multiplication and division are performed left to right with equal priority. Similarly, addition and subtraction are equal priority and performed left to right after multiplication and division.
How do you evaluate 3 + 4 × 2² - (6 ÷ 3)?
Parentheses: 6÷3 = 2. Exponents: 2² = 4. Multiply: 4×4 = 16. Now left to right: 3 + 16 - 2 = 17. Follow each PEMDAS step carefully.