Math Example: Language of Math--Numerical Expressions--Multiplication--Example 13

Topic

Numerical Expressions

Description

This example illustrates how to convert the statement "Two by negative twenty" into a numerical expression. The word "by" is often used to express dimensions and can indicate multiplication, especially when calculating area. In this case, it translates to the expression 2 * (-20), introducing the concept of multiplying a positive number by a negative one.

Understanding numerical expressions is fundamental in mathematics as it allows students to translate verbal descriptions into mathematical language. This collection of examples helps teach the topic by presenting various scenarios where multiplication is expressed in everyday language, including cases involving negative numbers. Students learn to recognize key phrases and translate them into mathematical symbols, while also grasping the rules for multiplying positive and negative numbers.

Providing multiple worked-out examples is crucial for students to fully comprehend the concept of numerical expressions, especially when dealing with positive and negative numbers. Each example reinforces the underlying principles while introducing slight variations, helping students develop a flexible understanding of how language can represent mathematical operations. This approach aids in building pattern recognition skills and enhances overall mathematical fluency.

Teacher Script: "Let's look at this example closely. The word 'by' here indicates multiplication, just like when we describe the dimensions of a rectangle. Notice how we handle the negative number - it keeps its sign in the expression. Can you think of a real-world situation where you might use 'by' to describe a multiplication problem, possibly involving a negative number?"

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