Lesson Plan
Number Bonds: Part-Whole Power!
Students will be able to identify the parts and whole in a number bond and complete number bonds for numbers up to 10.
Understanding number bonds helps students visualize how numbers are made, which is crucial for mastering addition and subtraction facts quickly and efficiently. It builds a strong foundation for more complex math concepts.
Audience
2nd Grade Students
Time
30 minutes
Approach
Interactive discussion, visual aids, and hands-on practice.
Materials
Whiteboard or projector, Markers or pens, Number Bond Warm-Up, Number Bonds Slide Deck, Number Bonds Worksheet, and Cubes or counters (optional)
Prep
Prepare Materials
10 minutes
- Review the Number Bonds Lesson Plan and all linked materials: Number Bond Warm-Up, Number Bonds Slide Deck, Number Bonds Worksheet, and Number Bonds Answer Key.
- Ensure whiteboard or projector is ready.
- Have markers/pens and optional manipulatives (cubes or counters) accessible.
- Print copies of the Number Bond Warm-Up and Number Bonds Worksheet.
Step 1
Warm-Up: What Makes Ten?
5 minutes
- Distribute the Number Bond Warm-Up to each student.
- Ask students to quickly complete the warm-up, focusing on pairs of numbers that make ten.
- Briefly review answers as a class, highlighting how different numbers can combine to form a sum.
Step 2
Introduction to Number Bonds
10 minutes
- Display Number Bonds Slide Deck - Slide 1 (Title).
- Engage students with the idea of 'parts' and 'wholes' using real-world examples (e.g., a pizza cut into slices, a group of friends).
- Display Number Bonds Slide Deck - Slide 2 (What are Number Bonds?). Explain the concept of a number bond: two 'parts' combine to make a 'whole'.
- Use Number Bonds Slide Deck - Slide 3 (Example 1: Number Bond for 5) to demonstrate with a simple number like 5, showing different part combinations (1 and 4, 2 and 3).
- Use Number Bonds Slide Deck - Slide 4 (Example 2: Number Bond for 8) for another example.
- Encourage students to use cubes or counters if they are having difficulty visualizing the parts and whole.
Step 3
Guided Practice: Creating Number Bonds
10 minutes
- Display Number Bonds Slide Deck - Slide 5 (Let's Try It! Number Bond for 7).
- Guide students to verbally identify different pairs of numbers that make the whole (e.g., for 7, parts could be 3 and 4, 2 and 5, etc.). Write their suggestions on the board.
- Distribute the Number Bonds Worksheet.
- Work through the first one or two problems together on the board or projector, ensuring students understand how to fill in the missing parts or wholes.
Step 4
Independent Practice
5 minutes
- Have students complete the remaining problems on the Number Bonds Worksheet independently.
- Circulate to provide support and clarification as needed.
Step 5
Wrap-Up: Sharing and Reflection
Optional
- Briefly review a few answers from the Number Bonds Worksheet as a class, using the Number Bonds Answer Key.
- Ask students to share one new thing they learned about number bonds or one number bond they found interesting.
Slide Deck
Number Bonds: Part-Whole Power!
Understanding numbers through their parts!
Get ready to become number bond superheroes!
Welcome students and introduce the lesson's exciting topic! Ask what they think 'part-whole power' might mean.
What Are Number Bonds?
A number bond shows how two or more parts combine to make a whole.
It's like a puzzle where all the pieces fit together to make one big picture!
Explain that a number bond helps us see how smaller numbers (parts) come together to make a bigger number (the whole). Use a simple analogy like ingredients in a recipe making a finished dish.
Example: Number Bond for 5
If the whole is 5...
What are some parts that make 5?
- Part 1: __ Part 2: __
Let's try: 2 and 3 make 5!
Use fingers, counters, or drawings to visually represent the parts making the whole. Ask students for different ways to make 5.
Example: Number Bond for 8
If the whole is 8...
What are some parts that make 8?
- Part 1: __ Part 2: __
Let's try: 6 and 2 make 8!
Reinforce the concept with another example. Emphasize that the parts can be arranged in any order. Ask for different ways to make 8.
Let's Try It! Number Bond for 7
The whole is 7.
What are two parts that can make 7?
Think about it, share with a partner, and then let's see how many different ways we can find!
This is for guided practice. Ask students to shout out different pairs of numbers that make 7. Write them on the board. This transitions into the worksheet.
Warm Up
Number Bond Warm-Up
Directions: Look at each number bond. Fill in the missing part to make 10!
-
Whole: 10
Part 1: 7
Part 2: -
Whole: 10
Part 1: 4
Part 2: -
Whole: 10
Part 1: 5
Part 2: -
Whole: 10
Part 1: 1
Part 2: -
Whole: 10
Part 1: 8
Part 2:
Worksheet
Number Bonds Worksheet
Directions: Complete each number bond by filling in the missing part or the whole.
Set 1: Find the missing part
-
Whole: 6
Part 1: 2
Part 2: -
Whole: 9
Part 1: 5
Part 2: -
Whole: 7
Part 1: 3
Part 2: -
Whole: 10
Part 1: 8
Part 2:
Set 2: Find the whole
-
Part 1: 4
Part 2: 3
Whole: -
Part 1: 1
Part 2: 6
Whole: -
Part 1: 5
Part 2: 5
Whole:
Set 3: Create your own!
-
Choose any whole number between 6 and 10. Draw a number bond and fill in the parts.
Whole:
Part 1:
Part 2:
Answer Key
Number Bonds Answer Key
Here are the answers and explanations for the Number Bond Warm-Up and Number Bonds Worksheet.
Number Bond Warm-Up Answers
-
Whole: 10
Part 1: 7
Part 2: 3- Thought Process: To find the missing part, we think: "What number do I add to 7 to get 10?" Counting up from 7 (8, 9, 10) gives us 3.
-
Whole: 10
Part 1: 4
Part 2: 6- Thought Process: What number makes 10 with 4? If I have 4, I need 6 more to reach 10.
-
Whole: 10
Part 1: 5
Part 2: 5- Thought Process: 5 and 5 is a known "doubles fact" that makes 10.
-
Whole: 10
Part 1: 1
Part 2: 9- Thought Process: Starting with 1, we can count up 9 more to reach 10.
-
Whole: 10
Part 1: 8
Part 2: 2- Thought Process: 8 and 2 are a common pair that makes 10.
Number Bonds Worksheet Answers
Set 1: Find the missing part
-
Whole: 6
Part 1: 2
Part 2: 4- Thought Process: 6 - 2 = 4, or 2 + 4 = 6.
-
Whole: 9
Part 1: 5
Part 2: 4- Thought Process: 9 - 5 = 4, or 5 + 4 = 9.
-
Whole: 7
Part 1: 3
Part 2: 4- Thought Process: 7 - 3 = 4, or 3 + 4 = 7.
-
Whole: 10
Part 1: 8
Part 2: 2- Thought Process: 10 - 8 = 2, or 8 + 2 = 10.
Set 2: Find the whole
-
Part 1: 4
Part 2: 3
Whole: 7- Thought Process: To find the whole, we add the parts: 4 + 3 = 7.
-
Part 1: 1
Part 2: 6
Whole: 7- Thought Process: Add the parts: 1 + 6 = 7.
-
Part 1: 5
Part 2: 5
Whole: 10- Thought Process: Add the parts: 5 + 5 = 10.
Set 3: Create your own!
- Answers will vary, but for example:
-
Whole: 8
Part 1: 3
Part 2: 5 -
Thought Process: The student chooses a whole (e.g., 8) and then breaks it into two smaller numbers (parts) that add up to that whole (e.g., 3 and 5). Other examples could be 9 (4 and 5) or 6 (1 and 5).
-
Answer Key
Number Bonds Answer Key
Here are the answers and explanations for the Number Bond Warm-Up and Number Bonds Worksheet.
Number Bond Warm-Up Answers
-
Whole: 10
Part 1: 7
Part 2: 3- Thought Process: To find the missing part, we think: "What number do I add to 7 to get 10?" Counting up from 7 (8, 9, 10) gives us 3.
-
Whole: 10
Part 1: 4
Part 2: 6- Thought Process: What number makes 10 with 4? If I have 4, I need 6 more to reach 10.
-
Whole: 10
Part 1: 5
Part 2: 5- Thought Process: 5 and 5 is a known
Answer Key
Number Bonds Answer Key
Here are the answers and explanations for the Number Bond Warm-Up and Number Bonds Worksheet.
Number Bond Warm-Up Answers
-
Whole: 10
Part 1: 7
Part 2: 3- Thought Process: To find the missing part, we think: "What number do I add to 7 to get 10?" Counting up from 7 (8, 9, 10) gives us 3.
-
Whole: 10
Part 1: 4
Part 2: 6- Thought Process: What number makes 10 with 4? If I have 4, I need 6 more to reach 10.
-
Whole: 10
Part 1: 5
Part 2: 5- Thought Process: 5 and 5 is a known