# Lesson 9

The Birds

### Lesson Purpose

The purpose of this lesson is for students to use whole-number multiplication to solve problems.

### Lesson Narrative

In previous lessons, students learned to use the standard algorithm to multiply multi-digit numbers. In this lesson, they solve problems that involve multiplication. Students are not asked to use a particular algorithm when they solve these problems. Some of the numbers in the problems are large and cumbersome and lend themselves well to using the standard algorithm for multiplication. Other products have factors of 10 and other smaller factors and these lend themselves well to mental calculations or use of the associative and commutative properties of multiplication. Use this lesson as an opportunity to observe the strategies your students are applying.
• Action and Expression
• MLR1

### Learning Goals

Teacher Facing

• Solve problems that involve the multiplication of multi-digit numbers.

### Student Facing

• Let’s solve multiplication problems.

### Lesson Timeline

 Warm-up 10 min Activity 1 15 min Activity 2 20 min Lesson Synthesis 10 min Cool-down 5 min

### Teacher Reflection Questions

If you were to teach this lesson over again, what activity would you redo? How would your proposed changes support student learning?

### Suggested Centers

• Number Puzzles: Multiplication and Division (4–5), Stage 2: Multi-digit Factors (Addressing)