Lesson: Writing and Evaluating Algebraic Expressions Mathematics • 7th Grade

In this lesson, we will learn how to write algebraic expressions and evaluate them for specific values of their variables.

Lesson Plan

Students will be able to

write an algebraic expression, using one or more basic operations, to represent
- a geometric situation,
- a word problem,
identify when two algebraic expressions are equivalent,
write an algebraic expression and evaluate it for a specific value of the variable,
solve more complex problems, such as writing and evaluating an algebraic expression involving more than one variable or writing an algebraic expression for the area of a simple shape when given the perimeter.

Lesson Video

Lesson Playlist

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01:24
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01:38

Lesson Worksheet

Q1:

Evaluate , given that and .

Q2:

Consider the shown trapezoid.

Write an expanded expression for its area. Simplify the expression, if possible.

The given trapezoid is the cross section of a prism of length . Write an expanded expression for the volume of the prism. Simplify the expression, if possible.

Q3:

Consider the shown trapezoid.

Write an expanded expression for its area. Simplify the expression, if possible.

The given trapezoid is the cross section of the given prism of length .

Write an expanded expression for the volume of the prism. Simplify the expression, if possible.