lenny

Number Bonds Adventure

user image
For Schools

Lesson Plan

Number Bonds Adventure

Students will be able to identify and create number bonds up to 20, demonstrating their understanding of part-whole relationships.

Understanding number bonds is crucial for developing strong mental math skills and provides a foundation for more complex addition and subtraction strategies. It helps students visualize how numbers can be broken apart and put together.

Audience

2nd Grade

Time

30 minutes

Approach

Interactive instruction, guided practice, and independent application.

Materials

Whiteboard or Projector, Markers or Pens, Number Bonds Adventure Slide Deck, Number Bonds Worksheet, Number Bonds Answer Key, and Manipulatives (e.g., unifix cubes, counters)

Prep

Gather Materials & Review Content

10 minutes

  • Review the Number Bonds Adventure Slide Deck to familiarize yourself with the content and flow.
    * Print or prepare to project the Number Bonds Worksheet.
    * Gather manipulatives for each student or pair (e.g., 20 unifix cubes or counters).
    * Ensure you have access to the Number Bonds Answer Key for quick reference during grading or discussion.
    * Prepare your whiteboard or projector and markers/pens for demonstration.

Step 1

Warm-Up: Brain Builder (5 minutes)

5 minutes

  • Display a simple addition problem (e.g., 7 + 3 = ?) on the board. Ask students to solve it mentally or using fingers.
    * Introduce the concept of

Step 2

Understanding number bonds as parts of a whole will make tackling tougher addition and subtraction much easier later on! You'll also see how knowing one number bond can help you figure out others. Get ready to power up your math brains!

2 minutes

Introduce today's lesson: "Today, we're going to become 'Number Bond Detectives'! We'll investigate how numbers stick together and break apart. Have you ever seen a puzzle where pieces fit perfectly? Number bonds are just like that! We'll use our brains and some cool tools to figure out how numbers make a whole."

Step 3

What Are Number Bonds? (7 minutes)

7 minutes

  • Use the Number Bonds Adventure Slide Deck (Slides 2-5) to introduce number bonds.
    * Explain that a number bond shows how two or more numbers (parts) combine to make a larger number (whole).
    * Use manipulatives to demonstrate a few examples. For instance, put out 10 counters. Say, "I have 10 counters. If I put 6 here (separate 6), how many are left? (4) So, 6 and 4 are parts that make the whole, 10!"
    * Ask students to replicate simple number bonds with their manipulatives, guided by prompts from the slide deck.

Step 4

Exploring Number Bonds to 10 and 20 (8 minutes)

8 minutes

  • Continue using the Number Bonds Adventure Slide Deck (Slides 6-9) to explore different number bonds, focusing on sums up to 20.
    * Show examples like 8 and 7 make 15, or 12 and 5 make 17.
    * Emphasize the commutative property (e.g., 6 + 4 is the same as 4 + 6).
    * Pose questions to students: "If we know 10 is made of 7 and 3, what other pairs can you find that make 10?"
    * Encourage students to use their manipulatives to discover new bonds.

Step 5

Practice Time: Number Bond Worksheet (5 minutes)

5 minutes

  • Distribute the Number Bonds Worksheet.
    * Explain the instructions clearly, ensuring students understand they need to find the missing part or the whole.
    * Circulate around the room, providing individual support and checking for understanding.
    * Encourage students to use their manipulatives if they need help visualizing the parts and wholes.

Step 6

Share & Discuss (3 minutes)

3 minutes

  • Bring the class back together. Ask a few students to share one of their completed number bonds from the worksheet.
    * Discuss different strategies they used to find the missing parts or wholes.
    * Use the Number Bonds Answer Key as a reference for quick checking during this discussion.

Step 7

Wrap-Up: Number Bond Challenge (2 minutes)

2 minutes

  • Pose a challenge question: "If I have 18 stickers and I give 9 to my friend, how many do I have left? What number bond does this show?"
    * Collect worksheets and remind students that understanding number bonds will help them become super math solvers!
lenny

Slide Deck

Welcome, Number Bond Detectives!

Ready for a math adventure?

Welcome students and get them ready for the lesson. Engage them with a fun, intriguing question.

What Are Number Bonds?

Numbers can be broken into parts that make a whole!

Think of a whole cookie... and then breaking it into two pieces. Those pieces are the parts!

Introduce the idea of parts and a whole using a relatable example. Use manipulatives to demonstrate.

Number Bond Basics

Part + Part = Whole

Example: If you have 5 apples, and 3 are red and 2 are green, then 3 and 2 are the parts, and 5 is the whole.

Visually demonstrate a simple number bond with an image or by drawing. Guide students to identify the parts and the whole.

Let's Build Number Bonds!

Using your manipulatives, show me two parts that make the whole number 10.

What two numbers did you use?

Provide an interactive slide. Ask students to use their manipulatives to show a number bond for 10. For example, 7 and 3.

Bigger Bonds: To 20!

What if we have 15 crayons?

If 10 are blue, how many are not blue?

10 + ? = 15

Introduce another example for a number bond up to 20. Emphasize the connection to real-life objects.

Find the Missing Part!

If the whole is 12, and one part is 4, what's the other part?

4 + ? = 12

Challenge students with a missing part problem. Encourage them to use subtraction or counting on.

Many Ways to Make a Whole!

Can you think of another way to make 12 using two different parts?

What if one part is 6? What's the other part?

Show how different pairs can make the same whole. This reinforces flexibility in thinking about numbers.

Time to Practice!

You'll get a worksheet to become a super Number Bond Detective on your own!

Remember: Part + Part = Whole

Transition to the worksheet. Explain that this is their chance to practice what they've learned.

You Are Number Bond Experts!

Great job today, Number Bond Detectives!

Keep practicing, and you'll be math masters!

Conclude the lesson by reiterating the importance of number bonds.

lenny

Worksheet

Number Bonds Worksheet: Detective Mode On!

Name: ________________________ Date: _______________

Hello, Number Bond Detectives! Your mission is to fill in the missing parts or the whole for each number bond. Use your math super skills!

Part 1: Find the Missing Part!

  1. Whole: 10
    Part 1: 6
    Part 2: ?



  2. Whole: 8
    Part 1: 3
    Part 2: ?



  3. Whole: 12
    Part 1: 7
    Part 2: ?



  4. Whole: 15
    Part 1: 9
    Part 2: ?



  5. Whole: 18
    Part 1: 10
    Part 2: ?



Part 2: Find the Whole!

  1. Part 1: 5
    Part 2: 4
    Whole: ?



  2. Part 1: 7
    Part 2: 7
    Whole: ?



  3. Part 1: 11
    Part 2: 6
    Whole: ?



  4. Part 1: 8
    Part 2: 9
    Whole: ?



  5. Part 1: 13
    Part 2: 5
    Whole: ?



Part 3: Create Your Own!

Draw your own number bond for the number 20. Fill in the parts and the whole.











lenny
lenny

Answer Key

Number Bonds Answer Key: Detective Solutions!

Here are the solutions for the Number Bonds Worksheet.

Part 1: Find the Missing Part!

  1. Whole: 10
    Part 1: 6
    Part 2: 4
    Thought Process: If the whole is 10 and one part is 6, I can count up from 6 to 10 (7, 8, 9, 10 - that's 4 more). So, the missing part is 4. Also, 10 - 6 = 4.

  2. Whole: 8
    Part 1: 3
    Part 2: 5
    Thought Process: I know 3 + 5 = 8, so the missing part is 5. Also, 8 - 3 = 5.

  3. Whole: 12
    Part 1: 7
    Part 2: 5
    Thought Process: I can count up from 7 to 12 (8, 9, 10, 11, 12 - that's 5 more). So, the missing part is 5. Also, 12 - 7 = 5.

  4. Whole: 15
    Part 1: 9
    Part 2: 6
    Thought Process: I can count up from 9 to 15 (10, 11, 12, 13, 14, 15 - that's 6 more). So, the missing part is 6. Also, 15 - 9 = 6.

  5. Whole: 18
    Part 1: 10
    Part 2: 8
    Thought Process: If 10 is one part of 18, then the other part must be 8 because 10 + 8 = 18. Also, 18 - 10 = 8.

Part 2: Find the Whole!

  1. Part 1: 5
    Part 2: 4
    Whole: 9
    Thought Process: To find the whole, I add the parts together: 5 + 4 = 9.

  2. Part 1: 7
    Part 2: 7
    Whole: 14
    Thought Process: I add the parts: 7 + 7 = 14.

  3. Part 1: 11
    Part 2: 6
    Whole: 17
    Thought Process: I add the parts: 11 + 6 = 17.

  4. Part 1: 8
    Part 2: 9
    Whole: 17
    Thought Process: I add the parts: 8 + 9 = 17.

  5. Part 1: 13
    Part 2: 5
    Whole: 18
    Thought Process: I add the parts: 13 + 5 = 18.

Part 3: Create Your Own!

Draw your own number bond for the number 20. Fill in the parts and the whole.

*Example Solution: This is an open-ended question, and many answers are possible. Here's one example:

Whole: 20
Part 1: 10
Part 2: 10

Thought Process: I need two numbers that add up to 20. I know that 10 and 10 make 20, so I can use those as my parts. Other correct answers could be 15 and 5, 12 and 8, 19 and 1, etc. Students should demonstrate understanding of the part-whole relationship for the number 20.

lenny
lenny