Teaching the Double the Double strategy for 3rd graders.

🍎 Learning Objectives

By the end of this lesson, students will be able to:

• 🎯 Understand the concept of doubling a number.
• ➕ Apply the 'Double the Double' strategy to multiply by 4.
• ✅ Solve multiplication problems using this strategy with accuracy.

🎒 Materials Needed

• Whiteboard or projector.
• Markers or pens.
• Worksheets with multiplication problems (e.g., 3 x 4, 5 x 4, etc.).
• 🎲 Number cubes (dice).
• 🧮 Counters (optional).

👋 Warm-up (5 minutes)

• 🗣️ Doubling Practice: Start by asking students to quickly double numbers. For example, "What is double 2? What is double 5?"
• ✍️ Write on Board: Write some simple doubling problems on the board like 2+2=4, 5+5=10, 7+7=14.

✏️ Main Instruction (20 minutes)

Explain the Strategy:

• 💡 Introduce the concept: Explain that multiplying by 4 is the same as doubling a number and then doubling the result again.
• ✍️ Step-by-step example:

1. 📖 Write a problem on the board, such as 3 x 4.
2. 1️⃣ Explain: "We can think of 3 x 4 as 'double 3, then double the answer'."
3. 2️⃣ Double 3: What is 3 doubled? (6)
4. 3️⃣ Then, double 6: What is 6 doubled? (12)
5. ✅ Therefore, 3 x 4 = 12.

• 🧑‍🏫 Visual Representation: Use counters or drawings to show how this works. For example, if you have 3 groups of 4 counters, you can rearrange them to show two groups of 6.

Guided Practice:

• 🤝 Work through a few more examples together as a class. Ask students to participate and explain each step.
• 🗣️ Examples:

1. 4 x 4: Double 4 = 8, Double 8 = 16. So, 4 x 4 = 16.
2. 5 x 4: Double 5 = 10, Double 10 = 20. So, 5 x 4 = 20.

• 🙋 Encourage students to verbalize the process.

Independent Practice:

• ✍️ Give students a worksheet with multiplication problems to solve using the 'Double the Double' strategy.
• 🚶‍♂️ Circulate the room to provide support and answer questions.

📝 Assessment (15 minutes)

• ✅ Practice Quiz: Have students complete the following problems, showing their work.

1. 2 x 4 = ?
2. 6 x 4 = ?
3. 8 x 4 = ?
4. 9 x 4 = ?
5. 1 x 4 = ?
6. 7 x 4 = ?
7. 10 x 4 = ?

• 📊 Observe: As students work, observe their strategies and understanding.
• ⭐ Review: Review the answers together as a class and address any misconceptions.