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Addition Ace Ascent

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Lesson Plan

Addition Ace Ascent

Students will be able to use various strategies (like expanded form, place value, and number line) to accurately add two and three-digit numbers without regrouping.

Understanding these strategies builds a strong foundation for mental math and more complex addition, helping students see how numbers work and making math less intimidating.

Audience

3rd Grade Students (3 students with 1st Grade math skills)

Time

30 minutes

Approach

Hands-on, guided practice, and visual aids.

Materials

Whiteboard or chart paper, Dry-erase markers, Base ten blocks (hundreds, tens, ones), Slide Deck: Addition Strategies, Warm Up: Number Sense Builder, Activity: Build It, Add It!, and Cool Down: Quick Check

Prep

Teacher Preparation

10 minutes

Step 1

Warm-Up: Number Sense Builder

5 minutes

  • Distribute the Warm Up: Number Sense Builder worksheet.
    - Ask students to quickly solve the single-digit and two-digit addition problems (without regrouping) to activate prior knowledge.
    - Briefly review answers as a group, encouraging students to share their strategies.

Step 2

Introduction to Addition Strategies (Slide Deck)

8 minutes

  • Present the Slide Deck: Addition Strategies.
    - Slide 1: Title Slide - Introduce the exciting name of the lesson.
    - Slide 2: What's Our Goal? - Explain the learning objective in student-friendly language.
    - Slide 3: Why Does This Matter? - Discuss the real-world relevance of addition.
    - Slide 4: Strategy 1: Expanded Form - Explain and demonstrate how to break numbers into hundreds, tens, and ones before adding.
    - Slide 5: Strategy 2: Place Value Power - Show how to line up numbers by place value and add each column, starting from the ones.
    - Slide 6: Strategy 3: Number Line Leap - Demonstrate how to use a number line for adding larger numbers by making
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Slide Deck

Addition Ace Ascent!

Let's become Addition Aces!

Welcome the students and introduce the lesson's fun title. Emphasize that we're going on an 'Addition Ace Ascent' to become masters of adding bigger numbers.

What's Our Goal?

Learn easy ways to add 2-digit and 3-digit numbers without regrouping.

Clearly state the learning objective. Make it sound achievable and exciting for them. "Today, we're going to learn super cool ways to add two and three-digit numbers, even big ones, without getting mixed up!"

Why Does This Matter?

Addition helps us every day!

  • Counting toys
  • Figuring out scores in a game
  • Shopping!

Explain why learning addition is important in real life. Ask them for examples of when they might use addition.

Strategy 1: Expanded Form

Break numbers into their place values (hundreds, tens, ones) and then add!

Example: 32 + 17
30 + 2
10 + 7

40 + 9 = 49

Introduce the expanded form strategy. Model an example like 23 + 45. Explain how to break numbers down by place value. "Think of 23 as 20 + 3 and 45 as 40 + 5. Then add the tens together and the ones together!"

Strategy 2: Place Value Power

Line up your numbers by place value.
Add the ones column first.
Then add the tens column.
Then add the hundreds column.

Example:
124

  • 235

359

Introduce the place value strategy. Emphasize lining up numbers correctly. Model an example like 124 + 235. "Always start adding from the ones place! Then the tens, then the hundreds."

Strategy 3: Number Line Leap

Start at the first number.
Make big jumps for hundreds and tens.
Make small jumps for ones.

Example: 45 + 23
Start at 45.
Jump 2 tens (+10, +10).
Jump 3 ones (+1, +1, +1).
Where do you land?

Introduce using a number line. Model an example. Start at the first number, then make large jumps for tens/hundreds and small jumps for ones. "Let's try 52 + 20. Start at 52, jump 10, then jump another 10! Where do we land?"

Time to Build & Add!

Let's use our base ten blocks to practice these strategies!

Transition to the hands-on activity. Explain that they will get to 'build' numbers and 'add' them using blocks.

You're Addition Aces!

Remember our strategies:

  • Expanded Form
  • Place Value Power
  • Number Line Leap

Keep practicing and you'll be addition experts!

Conclude the presentation by reinforcing the strategies and encouraging practice. Ask if they have any questions.

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Warm Up

Warm Up: Number Sense Builder

Welcome, math explorers! Let's get our brains warmed up for some awesome addition.

Part 1: Single-Digit Superstars!

Solve these quick problems. Show your work if you like!

  1. 5 + 3 =


  2. 7 + 2 =


  3. 4 + 6 =


  4. 8 + 1 =


Part 2: Two-Digit Trainers! (No Regrouping Needed!)

Now, let's try some slightly bigger numbers. Remember, add the ones, then add the tens!

  1. 21 + 15 =





  2. 34 + 22 =





  3. 50 + 19 =





  4. 63 + 14 =





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Activity

Activity: Build It, Add It!

Materials: Base Ten Blocks (hundreds, tens, ones), Activity Sheet

Hey Addition Aces! Today, we're going to use our awesome base ten blocks to build numbers and then add them together. This will help us see exactly how our addition strategies work!

How to Play:

  1. Read the Problem: Look at the addition problem on your sheet.
  2. Build the First Number: Use your base ten blocks to show the first number. (For example, for 123, you'd use 1 hundred block, 2 ten blocks, and 3 one blocks).
  3. Build the Second Number: Underneath the first number, use your base ten blocks to show the second number.
  4. Add the Ones: Push all your ones blocks together and count them. Write the total in the ones column.
  5. Add the Tens: Push all your tens blocks together and count them. Write the total in the tens column.
  6. Add the Hundreds: Push all your hundreds blocks together and count them. Write the total in the hundreds column.
  7. Write Your Answer: What is your grand total? Write it down!

Practice Problems:

Problem 1:

23 + 14 = ?

  • Build 23: (Draw 2 tens and 3 ones here)


  • Build 14: (Draw 1 ten and 4 ones here)


  • Total Ones:


  • Total Tens:


  • Answer:


Problem 2:

41 + 25 = ?

  • Build 41:


  • Build 25:


  • Total Ones:


  • Total Tens:


  • Answer:


Problem 3:

132 + 105 = ?

  • Build 132:


  • Build 105:


  • Total Ones:


  • Total Tens:


  • Total Hundreds:


  • Answer:


Problem 4:

204 + 163 = ?

  • Build 204:


  • Build 163:


  • Total Ones:


  • Total Tens:


  • Total Hundreds:


  • Answer:


Challenge Problem (Optional!):

310 + 250 = ?

  • Build 310:


  • Build 250:


  • Total Ones:


  • Total Tens:


  • Total Hundreds:


  • Answer:


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Cool Down

Cool Down: Quick Check

Great job today, Addition Aces! Before we wrap up, let's do a quick check to see what you've learned.

Part 1: Show What You Know!

Solve these problems using any strategy we discussed today (expanded form, place value, or number line). Show your work if it helps you!

  1. 42 + 35 =





  2. 112 + 207 =










Part 2: Reflect and Share!

  1. What was your favorite strategy to use today? Why?











  2. What is one thing you learned about adding bigger numbers today?











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