Multiplication Made Fun

Lesson Overview

Grade Level

4th Grade

Subject

Mathematics

Duration

60 Minutes

Curriculum Area

Common Core State Standards - Mathematics

• Standard 4.NBT.B.5: Multiply a whole number of up to four digits by a one-digit whole number.

Objective

Students will be able to efficiently multiply two-digit numbers by a one-digit number using mental math strategies and practice differentiated activities in centers.

---

Materials Needed

• Whiteboard and markers
• Chart paper
• Markers and colored pencils
• Number cards (0-9)
• Dice
• Multiplication flashcards
• Worksheets for each center
• Timer

---

Lesson Structure

Introduction (10 minutes)

1. Warm-up Activity: Begin with a quick mental math exercise. Ask the students simple one-digit multiplication problems (e.g., 6 x 3, 7 x 4) to activate their prior knowledge.

2. Hook: Share an interesting real-life scenario where multiplication might be used, such as calculating the total number of candies if they receive 3 pieces each from 15 friends. Discuss briefly how mental math can be quicker and more efficient.

3. Objective Introduction: Explain the lesson objectives. Emphasize that by the end of the class, they will be better at solving two-digit by one-digit multiplication problems in their heads using different strategies.

Direct Instruction (15 minutes)

1. Teach Strategies:

   • Decompose Numbers: Break down two-digit numbers for easier multiplication. For example, to solve 23 x 4, students can calculate 20 x 4 and 3 x 4, then add the results.
   • Using Doubling: Use doubling to tackle multiplication of numbers that are close to what they know. For instance, for 9 x 6, students can think of it as (10 x 6) - 6.
   • Compatible Numbers: Find numbers that pair well to simplify multiplication. Convert 25 x 4 to 100 by recognizing that 25 is a quarter of 100.

2. Modeling: Demonstrate each strategy on the whiteboard with example problems. Engage students by asking them to solve parts of the problems.

3. Question Prompt: Encourage students to share any other mental math strategies they know or use to simplify multiplication.

Activity Centers (30 minutes)

Divide students into four centers. They will rotate every 7 minutes with 2 minutes for transition.

• Center 1: Number Cards and Dice

  • Activity: Students draw number cards to form two-digit numbers. Roll a die to get a one-digit number. Use decomposing strategy to multiply. Share results with the group.

• Center 2: Flashcard Challenge

  • Activity: Flashcards with multiplication problems displayed one at a time. Students use doubling or compatible numbers strategy. Track time to add a competitive element.

• Center 3: Creative Multiplication Artwork

  • Activity: Use markers and colored pencils to create mini-posters for their favorite strategy. Present how the strategy is used through pictures and numbers.

• Center 4: Interactive Word Problems

  • Activity: Solve word problems involving multiplication. Encourage the use of compatible numbers strategy. Provide worksheets with practical scenarios.

Conclusion (5 minutes)

• Class Discussion: Gather students and ask them to share what strategies they found most effective. Discuss how different situations might influence which strategy to use.
• Exit Ticket: Give a quick problem of multiplying a two-digit number by a one-digit number. Collect their responses to assess understanding.
• Wrap Up: Encourage students that these mental strategies will help them save time and be more efficient in solving mathematical problems in real life.

Assessment and Reflection

• Informal Assessment: Monitor each center to check students' application of strategies and problem-solving skills.
• Formal Assessment: Review exit tickets to ensure individual comprehension and mastery of the lesson objective.
• Feedback: Ask students to write one sentence about what they learned and one question they still have about multiplying two-digit numbers.

---

By presenting multiplication through interactive and engaging methods, this lesson aims to enhance the students' mental math capabilities, thus empowering them with tools for quick and effective problem-solving.