Multiply Like a Math Magician! Script

Warm-Up: The Magic Number Challenge (5 minutes)

Teacher: "Good morning, future Math Magicians! To get our brains warmed up and ready for some serious number magic, we're going to start with a quick 'Magic Number Challenge.' I'm handing out a Multi-Digit Multiplication Warm-Up now. Please work silently and independently to solve these problems. Think about any strategies you already know. You have about 5 minutes. Go!"

(Circulate the room, observing student work and providing quiet encouragement.)

Teacher: "Alright, pencils down! Let's go over these. Who would like to share their answer and how they solved problem number one?"

(Call on a student, encourage discussion of different approaches if applicable. Repeat for other problems.)

Teacher: "Excellent job, everyone! It's great to see all the different ways you approach these problems. Today, we're going to focus on one powerful tool in your math magician's toolkit: the Standard Algorithm!"

Introduction: Unlocking the Power of Big Numbers (5 minutes)

Teacher: (Display Multiply Like a Math Magician! Slides - Slide 1: "Welcome, Math Magicians!")

Teacher: "Welcome, Math Magicians! Have you ever wondered how people calculate really big numbers quickly? Like, how many total seats are in a stadium with 35 rows and 21 sections, each holding 50 seats? Or how much a whole school trip for 120 students would cost if each ticket is $15? This isn't just about passing a math test; it's about gaining a real-world superpower!"

(Display Multiply Like a Math Magician! Slides - Slide 2: "Your Multiplication Superpower!")

Teacher: "Today, we're going to become masters of multi-digit multiplication using the Standard Algorithm. Our goal is to be able to accurately multiply multi-digit numbers, truly understand what's happening when we multiply, and feel super confident tackling any big numbers that come our way!"

Guided Practice: The Math Magician's Toolkit - Standard Algorithm (10 minutes)

Teacher: "Let's dive into our Math Magician's toolkit. We're going to learn one powerful 'spell' for multi-digit multiplication: the Standard Algorithm. This is probably the one you've seen the most. Think of it like building with numbers, one step at a time.

(Display Multiply Like a Math Magician! Slides - Slide 3: "The Standard Algorithm: Your Magic Formula!")

Teacher: "Let's try an example together: 23 x 14.

• First, we multiply by the ones digit. So, 4 times 3 is 12. Write down the 2, carry the 1.
• Then, 4 times 2 (which is really 20) is 80, plus the 1 we carried makes 90. So we write down 9. Our first 'partial product' is 92.
• Next, we move to the tens digit. This is super important: we need a zero placeholder! Since we're multiplying by 10 (the 1 in 14), our answer will start in the tens place.
• Now, 1 (tens) times 3 is 3 (tens). Write it under the 9.
• And 1 (tens) times 2 (tens) is 2 (hundreds). Write it down. Our second partial product is 230.
• Finally, we add our partial products: 92 + 230. What do we get? 322!"

(Work through this on the board, clearly showing each step and aligning numbers.)

Teacher: "Any questions about the standard algorithm? It's a classic for a reason! It's your magic formula for solving big multiplication problems."

Independent Practice: Casting Your Own Spells (8 minutes)

Teacher: (Display Multiply Like a Math Magician! Slides - Slide 4: "Time to Cast Your Own Spells!")

Teacher: "Now it's your turn to practice your magic! I'm handing out the Multi-Digit Multiplication Practice Worksheet. For each problem, you will use the Standard Algorithm to solve it. Show your work clearly so I can see your magical thinking! If you get stuck, re-check your steps or raise your hand and I'll come assist you. You have about 8 minutes for this. Get to it, Math Magicians!"

(Circulate, provide individual support, check for understanding, and prompt students to articulate their chosen strategy.)

Cool-Down: Reflecting on Your Magic (2 minutes)

Teacher: (Display Multiply Like a Math Magician! Slides - Slide 5: "Reflecting on Your Magic!")

Teacher: "Alright, bring your attention back up here for our cool-down! Before you go, I want you to complete this quick Multi-Digit Multiplication Cool-Down. Think about what you learned today, how the Standard Algorithm helped you, and if there's anything you still have questions about."

(Collect the cool-downs as students finish.)

Teacher: "Fantastic work today, Math Magicians! You've taken a big step in mastering multi-digit multiplication using the Standard Algorithm. Keep practicing, and your number magic will only grow stronger!"

Multi-Digit Multiplication Warm-Up

Instructions: Solve the following multiplication problems. Show your work!

1. 25 x 3 = ?
   
   
   
   

2. 18 x 10 = ?
   
   
   
   

3. What does it mean to multiply? Describe it in your own words.
   
   
   
   
   
   
   

Multi-Digit Multiplication Practice Worksheet

Instructions: Solve the following multi-digit multiplication problems. You will use the Standard Algorithm. Show all your work!

1. 34 x 12 = ?
   
   
   
   
   
   
   
   
   
   
   
   

2. 56 x 23 = ?
   
   
   
   
   
   
   
   
   
   
   
   

3. 71 x 45 = ?
   
   
   
   
   
   
   
   
   
   
   
   

4. 105 x 18 = ?
   
   
   
   
   
   
   
   
   
   
   
   

5. 213 x 32 = ?
   
   
   
   
   
   
   
   
   
   
   
   

6. Challenge Problem: A baker sells 135 cookies every day. How many cookies does the baker sell in 28 days?
   
   
   
   
   
   
   
   
   
   
   
   
   

Multi-Digit Multiplication Answer Key

Warm-Up: The Magic Number Challenge - Answer Key

1. 25 x 3 = 75
   Thought Process: Multiply 3 by 5 to get 15 (write 5, carry 1). Multiply 3 by 20 to get 60, add the carried 10 to get 70. Combine 70 + 5 = 75.

2. 18 x 10 = 180
   Thought Process: When multiplying by 10, simply add a zero to the end of the number. 18 becomes 180.

3. What does it mean to multiply? Describe it in your own words.
   Sample Answer: To multiply means to add a number to itself a certain number of times. It's a quick way to find the total when you have equal groups.

Multi-Digit Multiplication Practice Worksheet - Answer Key

1. 34 x 12 = 408
   *Standard Algorithm:
   34
   x 12

   68 (2 x 34)
   340 (10 x 34)

   408*

2. 56 x 23 = 1288
   *Standard Algorithm:
   56
   x 23

   168 (3 x 56)
   1120 (20 x 56)

   1288*

3. 71 x 45 = 3195
   *Standard Algorithm:
   71
   x 45

   355 (5 x 71)
   2840 (40 x 71)

   3195*

4. 105 x 18 = 1890
   *Standard Algorithm:
   105
   x 18

   840 (8 x 105)
   1050 (10 x 105)

   1890*

5. 213 x 32 = 6816
   *Standard Algorithm:
   213
   x 32

   426 (2 x 213)
   6390 (30 x 213)

   6816*

6. Challenge Problem: A baker sells 135 cookies every day. How many cookies does the baker sell in 28 days?
   135 x 28 = 3780 cookies
   *Standard Algorithm:
   135
   x 28

   1080 (8 x 135)
   2700 (20 x 135)

   3780*

Multi-Digit Multiplication Cool-Down

Instructions: Please answer the following questions to help me understand your learning today.

1. How did using the Standard Algorithm help you solve multi-digit multiplication problems today?
   
   
   
   
   
   
   

2. Solve the following problem using the Standard Algorithm. Show your work!

   45 x 16 = ?
   
   
   
   
   
   
   
   
   
   
   
   

3. What is one question you still have about multi-digit multiplication, or one thing you want to practice more?