Math Example: Language of Math--Variable Expressions--Multiplication and Subtraction--Example 22

Topic

Variable Expressions

Description

This example illustrates the conversion of the verbal statement "Negative twenty times a number less twenty" into the variable expression -20x - 20. It demonstrates how to interpret phrases like "times" and "less" when dealing with negative numbers, and translate them into algebraic operations, using x to represent "a number".

Variable expressions are a key concept in algebra, bridging the gap between everyday language and mathematical notation. This collection of examples guides students through the process of recognizing key phrases that indicate specific operations and translating them into symbolic form. By working through these examples, students develop crucial skills in mathematical interpretation and communication.

Exposure to multiple examples is essential for students to fully grasp the concept of variable expressions. Each example presents a slightly different scenario, helping students to recognize patterns and develop flexibility in their approach to translation. This repeated practice builds confidence and proficiency in a skill that is fundamental to more advanced algebraic concepts.

Teacher Script: Great job on this example! Notice how "negative twenty times a number" translates to -20x. The word "less" indicates subtraction, so we subtract 20 from this result. Can you think of a different way to phrase this same mathematical idea? Keep practicing with different word choices and negative numbers, and you'll become more flexible in your translations between words and math!

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