Year 3 Maths Lesson Plan: Addition and Subtraction Up To 100

Overview

This 20-minute lesson plan is designed for Year 3 students in New Zealand to develop their skills in addition and subtraction within the range of 100. The lesson aligns with the New Zealand Curriculum, specifically targeting Level 2 of the Mathematics learning area: Number and Algebra.

Lesson Objectives

By the end of this session, students will:

1. Demonstrate understanding of addition and subtraction up to 100.
2. Solve addition and subtraction problems using appropriate strategies.
3. Check their work using inverse operations.

Materials Needed

• Whiteboard and markers
• Individual mini whiteboards and markers for each student
• Sets of number cards from 0 to 100
• Printed worksheets with addition and subtraction problems
• Access to NZ Maths website tools (optional): NZ Maths Tools

Lesson Details

Introduction (5 minutes)

• Begin by engaging students with a quick interactive mental maths round: call out simple addition and subtraction problems within 100 and have students write answers on their mini whiteboards.
• Quickly review the concepts of addition as 'putting together' and subtraction as 'taking away'.

Main Activity (10 minutes)

Activity Setup: Divide the class into small groups and distribute number cards to each group.

Activity Execution:

1. Addition Relay:

   • Each group picks two number cards at random.
   • Students calculate the sum of these numbers and write the complete equation on their mini whiteboard.
   • They check their work with a partner before showing it to the teacher.

2. Subtraction Swap:

   • Using the same cards, students now choose one card to be the whole and another to be one part. They must figure out the missing part and write the subtraction equation.
   • Peers within the group verify the answers.

Consolidation (5 minutes)

• Regroup as a class and discuss the strategies used. Highlight any interesting methods or common mistakes.
• Use the whiteboard to demonstrate a few examples with input from students, showing both the traditional algorithm and number line methods.
• Emphasize checking work by using the inverse operation (e.g., checking subtraction by adding).

Conclusion (1 minute)

• Encourage students to practice these skills at home using worksheets or online tools provided on the NZ Maths website.
• Give a quick oral quiz of two problems to solve on their mini whiteboards as they leave the classroom.

Links for Additional Practice and Learning:

• NZ Maths - Add and Subtract

Assessment

• Observe student participation and accuracy during activities.
• Check group work for understanding and correct use of strategies.
• Collect worksheets at the end of the lesson for a formal assessment of individual understanding.

This plan is in line with the expectations of the New Zealand education standards for Year 3 students, focusing on practical application of addition and subtraction within 100, allowing students to develop their computational skills in a short, engaging format.