Grade 1 Mathematics Lesson Plan: Measurement

Lesson Plan Title:

Grade 1 Mathematics Lesson Plan: Estimating Mass

Materials Needed:

  • Various classroom objects (e.g., pencil, book, eraser, water bottle, toy)
  • Balance scales
  • Plastic bags or containers
  • Weights (e.g., beans, rice, or sand)
  • Worksheets
  • Interactive whiteboard or chart paper
  • Markers

Learning Objectives:

By the end of the lesson, students should be able to:
1. Understand the concept of mass and estimation.
2. Estimate and compare the mass of different objects.
3. Use a balance scale to measure and verify their mass estimates.


  1. Mass – The amount of matter in an object.
  2. Estimate – A rough calculation or judgement of the value, number, quantity, or extent of something.
  3. Balance scale – A device for weighing that has two pans.
  4. Heavier – Having more weight.
  5. Lighter – Having less weight.

Previous Learning:

Students have learned about physical properties of objects such as size, shape, and colour. They have also been introduced to basic counting and comparison (e.g., bigger/smaller, longer/shorter).

Anticipated Challenges and Solutions:

  • Challenge: Difficulty understanding mass as an abstract concept.
    • Solution: Use tangible objects to compare and measure.
  • Challenge: Inaccurate estimations.
    • Solution: Provide guided practice and use clear examples.

Beginning Activities (4 minutes):

  1. Introduction (2 minutes): Briefly explain the concept of mass and estimation.
  2. Activate Prior Knowledge (2 minutes): Ask students to share what they already know about comparing objects. Use questions like “Which is heavier, a pencil or a book?” to stimulate discussion.

Middle Activities (32 minutes):

  1. Direct Instruction (5 minutes): Demonstrate how to use a balance scale. Show how to place objects in both pans and compare their mass.
  2. Guided Practice (10 minutes): Divide the class into small groups. Give each group a set of objects and have them estimate which ones are heavier or lighter. Then, use balance scales to check their estimates.
  3. Independent Practice (15 minutes):
    • Hand out worksheets with images of objects.
    • Students estimate the mass of each object by marking “heavier” or “lighter”.
    • After estimating, allow students to experiment with actual objects and balance scales to verify their estimates.
  4. Group Discussion (2 minutes): Reconvene as a class and discuss findings. Questions could include: “Was your estimation correct?” “What did you learn about estimating mass?”

End Activities (4 minutes):

  1. Exit Ticket Activity (4 minutes):
    • Provide students with a quick worksheet where they draw or write the name of one object they found to be heavier and one object they found to be lighter.
    • Collect worksheets as they leave to assess understanding.

Assessment and Checks for Understanding:

  • Guided Practice Review: Monitor groups as they estimate and measure mass, providing corrections and guidance as needed.
  • Worksheet Review: Check students’ worksheets to see if they correctly estimated and verified the mass.
  • Exit Ticket: Use the exit ticket activity to gauge individual understanding.

Differentiation Strategies for Diverse Learners:

  • Scaffolding: Pair students with learning partners for peer support during activities.
  • Extension: For advanced learners, introduce more complex objects or subtle differences in mass for estimation.
  • Support: Provide additional hands-on demonstrations and use visual aids for students who struggle with the abstract concept of mass.

Teaching Notes:

  • Purpose and Educational Value: This lesson introduces the fundamental concept of mass and develops estimation and measurement skills crucial for mathematical reasoning and scientific understanding.
  • Teaching Tips: Keep activities dynamic and interactive to maintain engagement. Use real-life examples to illustrate concepts.
  • Accessibility: Ensure all materials are large enough to be seen clearly by all students and consider providing tactile objects for visually impaired students. Use clear and simple language to explain concepts.

This structured lesson plan will help engage Grade 1 learners in understanding and estimating mass, aligning seamlessly with the goals of the CAPS curriculum.

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