Lesson 9

Paper-and-Pencil Multiplication

Est. Class Sessions: 2–3

Summarizing the Lesson

Ask students to solve 23 × 8 in two ways. Then ask them to present their solutions to the class.

Ask:

How are the solutions alike?
How are they different?
Which method would you choose to solve the problem mentally?

Use Check-In: Questions 9–11 in the Student Guide to assess students' abilities to use paper-and-pencil methods to multiply [E8] and to choose among mental math strategies and paper-and-pencil methods to multiply [E5, E10].

Student Activity Book:

Master: