Multiplying Decimals and Whole Numbers: Using an Area Model

This lesson teaches how to multiply decimals and whole numbers using an area model. It begins with a review of base 10 blocks for representing numbers, then explains decimal representation. The lesson highlights common mistakes in decimal multiplication and introduces smart estimation. Through examples, such as a pancake recipe, it demonstrates practical applications of these concepts. The lesson concludes with a summary of the key points covered.

Explain the common mistake people make when multiplying decimals.

How did the teacher estimate the product of 2.4 and 1.3?

What is the area model used for in multiplying decimals and whole numbers?

What steps did the teacher take to multiply 1.5 by 3.5 using the area model?

What was the final answer when Valerie multiplied 1.5 by 3.5, and how does it compare to the smart estimate?