 Math, Grade 6
 Expressions

Substituting Numbers for Letters
 Math Tricks
 Evaluating Expressions
 Expressions in Words & Symbols
 Using Variables to Represent Measurements
 Substituting Numbers for Letters
 Mathematical Vocabulary
 Distributive Properties of Geometric Models
 Reviewing The Greatest Common Factor
 Common Multiples
 Writing, Representing & Evaluating Expressions
 Peer Review
 Gallery Problems Exercise
Instructor Overview
Students express the lengths of trains as algebraic expressions and then substitute numbers for letters to find the actual lengths of the trains.
Key Concepts
 An algebraic expression can be written to represent a problem situation. More than one algebraic expression may represent the same problem situation. These algebraic expressions have the same value and are equivalent.
 To evaluate an algebraic expression, a specific value for each variable is substituted in the expression, and then all the calculations are completed using the order of operations to get a single value.
Goals and Learning Objectives
 Evaluate expressions for the given values of the variables.
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