Math Example: Language of Math--Variable Expressions--Multiplication and Subtraction--Example 15

Topic

Variable Expressions

Description

This example demonstrates the conversion of the verbal statement "Subtract twenty times more than a number from negative one" into the variable expression -20x - 1. It showcases how to interpret a complex sentence structure involving multiplication, subtraction, and a negative number, and translate it into algebraic symbols, using x to represent "a number".

Variable expressions form the foundation of algebraic thinking, enabling the translation of real-world scenarios into mathematical language. This collection of examples guides students through the process of identifying key phrases that indicate specific operations and converting them into symbolic form. By engaging with these examples, students develop critical skills in mathematical interpretation and communication.

Encountering a variety of examples is crucial for students to fully comprehend the concept of variable expressions. Each example presents a unique scenario, challenging students to apply their understanding in different contexts. This diverse practice builds flexibility in thinking and reinforces the connection between verbal and symbolic representations of mathematical ideas.

Teacher Script: Excellent progress on this challenging example! Notice how the phrase "twenty times more than a number" translates to 20x. We're subtracting this from negative one, which gives us -20x - 1. Can you explain why the negative sign is distributed to both terms? Try rephrasing this statement in your own words while keeping the same mathematical meaning. This practice will help you become more comfortable with different ways of expressing the same mathematical idea!

For a complete collection of math examples related to Variable Expressions click on this link: Math Examples: Variable Expressions: Multiplication and Subtraction Collection.