Number Bonds Starter

Year Level

Year 2 (Ages 6-7)

Duration

60 minutes

Class Size

25 students

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Learning Objectives

Aligned with the New Zealand Curriculum Refresh (Phase 1 – Year 2 level) and using guidance from the Te Mātaiaho Maths 0-8 document, this lesson aims to:

• Understand the concept of number bonds as pairs of numbers that combine to make a total, specifically focusing on bonds summing to 20.
• Recognise and use number bonds as related to addition and subtraction facts within 20.
• Use visual and tactile materials to represent and explore number relationships.
• Use mathematical language to describe parts and wholes.
• Develop number sense through playful, concrete experiences that support fluency with addition and subtraction facts.

Curriculum References

• Number and Algebra: Number Structure
  • Partition and regroup whole numbers up to at least 20, using a systematic approach and noticing patterns
  • Recall addition facts up to 20 and their corresponding subtraction facts (families of facts), including doubles and halves
• Mathematical Processes: Communication
  • Use numbers, materials, and pictorial representations to show thinking and learn new ideas
  • Build mathematical vocabulary, engaging students in discussion and explanation
• Key Competencies
  • Thinking – Developing understanding through problem-solving activities
  • Managing self – Taking responsibility during independent and group activities
  • Relating to others – Using mathematical language in discussions and explaining reasoning

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Materials Needed

• Sets of number cards from 1 to 20 (multiple copies)
• Counters, small blocks, or bead strings (enough for pairs of students)
• Large number bond template poster or board showing number bonds to 20 (with two parts and a whole)
• Whiteboard and markers
• Individual whiteboards and markers for students (optional)
• Visual aids: 10s frames, number lines (if available)

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Lesson Outline and Timing

Time	Activity	Details
0-10 mins	Introduction and Connection	Gather students on the mat. Begin with a simple discussion: “What happens if we put some numbers together?” Introduce the idea of 'number bonds' as pairs of numbers that make a total. Use the large number bond template with a simple example (e.g. 10 + 10 = 20).
10-20 mins	Whole Class Modelled Activity	Show number cards 1 to 20. Invite students to find pairs that add up to 20. Demonstrate with the whole class how 7 and 13 make 20, asking students to explain their thinking. Use counters to verify physically. Explain how number bonds link to addition and subtraction (e.g., if 7 + 13 = 20, then 20 – 7 = 13). Emphasise the 'part-part-whole' concept.
20-35 mins	Paired Practice: Matching Number Bonds	Students work in pairs with number cards and counters. Task: find all pairs of numbers that make 20. Use counters to double-check, then discuss with their partner. Teacher circulates to facilitate discussion using mathematical vocabulary. Encourage students to say number sentences aloud (e.g. “7 and 13 make 20”).
35-45 mins	Group Sharing and Exploration	Couples share favourite or interesting pairs with the whole class using the large number bond display. Discuss how the pairs relate to addition and subtraction facts. Validate different approaches and encourage use of key vocabulary: 'part', 'whole', 'add', 'subtract', 'equals'.
45-55 mins	Interactive Game: Number Bond Hunt	Organise a fun game where number cards 1-20 are hidden around the room. Students find a card and attempt to find their 'bond' partner who makes 20 with their card number. Once matched, each pair shares their number sentence with the class or group. This consolidates fluency and social interaction.
55-60 mins	Reflection and Recap	As a class, review what a number bond is and why it helps us with addition and subtraction. Ask students: “What did you notice about the numbers that make 20?” Set a simple takeaway challenge: look for number bonds to 20 at home or in everyday life. Confirm next lesson focus will build on this understanding.

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Assessment and Feedback

• Formative: Observe students as they participate in pair and group activities. Note their ability to find number pairs and articulate number sentences.
• Check for Understanding: During group sharing, listen for correct use of mathematical language and recognition of parts and wholes.
• Exit Question: “Can you tell me what a number bond is?” or “What two numbers make 20?”
• Next Steps: Use formative observations to tailor future lessons, focusing on recall fluency with number bonds and exploring subtraction from 20.

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Teaching Tips and Considerations

• Use clear, consistent vocabulary: part, whole, bond, add, subtract.
• Encourage talk: Have students explain their thinking to peers.
• Use visuals and tactile materials to support conceptual understanding.
• Be sensitive to students’ language backgrounds by allowing multilingual discussion where helpful.
• Provide positive reinforcement to build confidence.
• Keep the tempo lively to maintain interest—incorporate games and movement.

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This lesson integrates the latest national curriculum expectations for Year 2 mathematics around number structure and operations, focusing on foundational number sense and facts to 20. The scaffolded activities support both conceptual understanding and fluency, critical at this stage for future success in more complex arithmetic and problem-solving 【4:1†Te Mataiaho Maths 0-8 (2).pdf】.

This approach to "Mastetudents’ engagement, mathematical thinking, and readiness for subsequent lessons in the unit.