Lesson Plan: Introduction to PENDAS
Subject: Mathematics
Grade: 8
Duration: 30 minutes
Objectives
By the end of the lesson, students will be able to:
- Understand what PENDAS stands for.
- Apply PENDAS to correctly solve mathematical expressions involving various operations.
- Demonstrate their understanding through practice problems.
Materials Needed
- Whiteboard and markers
- Printed handouts of practice problems
- Graphing calculator (optional)
Lesson Outline
1. Introduction to PENDAS (5 minutes)
- Definition: PENDAS stands for Parentheses, Exponents, Negatives, Division, Addition, and Subtraction.
- Importance: It is essential to remember the order of operations when solving mathematical expressions to ensure accuracy in results.
2. Breaking Down PENDAS (10 minutes)
-
Parentheses: Always solve expressions within parentheses first.
- Example: ( (4 + 2) \times 3 = 6 \times 3 = 18 )
-
Exponents: After parentheses, solve exponents.
- Example: ( 3^2 + 5 = 9 + 5 = 14 )
-
Negatives: Handle any negative signs in the expression.
-
Division and Multiplication: Next, solve division and multiplication from left to right.
- Example: ( 12 \div 3 \times 2 = 4 \times 2 = 8 )
-
Addition and Subtraction: Finally, perform addition and subtraction from left to right.
- Example: ( 3 + 4 - 2 = 5 )
3. Guided Practice (10 minutes)
- Work through example problems as a class using PENDAS:
- ( (7 + 3) \times 2 - 5 )
- ( 6 + 2^3 \div 2 )
- ( (2 \times 3) + (4 - 1) )
Encourage students to raise their hands and explain their thought process while solving each problem.
4. Independent Practice (3 minutes)
- Distribute handouts with practice problems for students to complete individually.
Homework Assignment
Students will complete the following problems at home. They are to show all work for full credit.
- Evaluate: ( 5 + (3 \times 4) - 2^2 )
- Simplify: ( (8 - 5) \times 3 + 10 \div 2 )
- Calculate: ( (12 \div 4) + 6 - (2^2) + 5 )
Correct Answers to Homework
- ( 5 + (3 \times 4) - 2^2 = 5 + 12 - 4 = 13 )
- ( (8 - 5) \times 3 + 10 \div 2 = 3 \times 3 + 5 = 9 + 5 = 14 )
- ( (12 \div 4) + 6 - (2^2) + 5 = 3 + 6 - 4 + 5 = 10 )
Closing (2 minutes)
- Recap the importance of using PENDAS in solving mathematical expressions.
- Remind students to practice at home and prepare questions for the next class.
Additional Notes
- Encourage students to use a calculator to check their work after solving expressions manually.
- Consider a follow-up lesson on more complex expressions involving each of the operations in PENDAS.