## Lesson: Multiplying Multiples of 10

Developing the Concept

In this lesson, students further their understanding of multiplication by using basic multiplication facts and word names for factors that are multiples of 10. The focus is on pattern development and multiplication properties.

**Materials:** base-ten blocks, colored chalk

**Preparation:** none

**Prerequisite Skills and Background:** Students should know the basic multiplication facts, how to use base-ten blocks, word names for multiples of 10, and how to multiply by 10 and 100. Students should also recall the Property of One for Multiplication.

**Wrap-Up and Assessment Hints**

This concept is essential to ensure accurate mental math. Have students work in pairs to quiz each other with similar examples. One student can write the multiplication expression, having either one or both factors as multiples of 10, on one side of an index card. The other student can write its product on the other side of the card. Exchange cards between pairs of students for checking.