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In this lesson, students learn about numeric expressions as mathematical relationships between numbers—not “number stories.” Students interpret and write addition, subtraction, multiplication, and division expressions given real-world contexts. Exponent expressions are introduced, and students write and simplify exponent expressions with positive indices.

Video

In this video, the concept of a math expression is introduced as indicating a quantity rather than telling a story from left to right, as students may have experienced expressions before. Students are given an example of a simple addition expression and multiplication expression.