Understanding Expressions with Algebra Tiles
Grade 6 Mathematics Exploring Variables and Constants 30-Minute Interactive Lesson
Have you ever used a secret code?
Think about games with mystery messages What if math had mystery numbers too? Today we'll crack the code of algebraic expressions!
What is an Algebraic Expression?
A math sentence with numbers, letters, and operations Letters are called variables (mystery numbers!) Example: 3x + 2 No equal sign - that makes it different from an equation
Building 3x + 2 with Algebra Tiles
Get your algebra tiles ready! Use 3 green x-tiles for '3x' Add 2 yellow unit tiles for '+2' Arrange them to show the expression
Parts of an Expression
{"left":"Term: Each part separated by + or -\nVariable: The letter (like x or y)\nCoefficient: Number in front of variable","right":"Constant: Number by itself\nOperation: + or - signs\nIn 3x + 2: '3x' and '2' are terms"}
Partner Challenge: Build These Expressions
Work with your partner Teacher will call out expressions Build each one with your tiles Write it on your dry-erase board Explain the parts to your partner
Quick Check: Is 3 + x an expression?
Look at: 3 + x What are its parts? Can you build it with tiles? Share your thinking with the class!
Today We Learned
Algebraic expressions have variables, constants, and operations Algebra tiles help us see expressions visually We can identify and name the parts of expressions Next time: We'll learn to evaluate expressions by substituting numbers for variables!