Decomposing and Composing Numbers: Understanding the Parts of Numbers

This lesson covers the concepts of decomposing and composing numbers. It begins with an introduction to numbers and their parts using base ten blocks. The lesson explains how to decompose single-digit numbers like 5 and 7 into smaller units and explores multiple ways to do so. It then addresses common misunderstandings when decomposing two-digit numbers, using examples like 24 and 87. The lesson concludes with composing numbers, demonstrating how to combine smaller units to form larger numbers, both single-digit and two-digit. Overall, the lesson emphasizes understanding numbers as compositions of smaller parts.

What does it mean to compose numbers? Give an example from the lesson.

Describe how the number 87 can be decomposed according to the lesson.