Lesson Notes By Weeks and Term v5 - Grade R

Lesson Video

This page supports the lesson note with a companion video and a short classroom-ready summary.

For class groups and homework, share this lesson page so learners also get the summary, objectives, and full lesson context.

Performance objectives

• This lesson introduces Grade R learners to the foundational concepts of measurement, specifically focusing on length (long/short) and mass (heavy/light). In the context of the South African CAPS curriculum, this topic is approached through informal, hands-on activities. Understanding these concepts is crucial for young learners as it forms the basis for all future mathematical learning in measurement. In their daily lives, South African children constantly make informal comparisons: comparing the length of their friend's shweshwe dress ribbon to their own, deciding which piece of boerewors is longer at a braai, or feeling the difference between a heavy bag of mealie meal and a light bag of bread. This lesson empowers them with the vocabulary and conceptual understanding to describe and interact with the world around them more precisely. The focus is on direct, sensory comparison rather than formal units of measurement.
• Learning Objectives (CAPS Aligned):
• By the end of this week, learners should be able to:
• Compare and describe the length of two objects using the vocabulary 'long', 'short', 'longer than', and 'shorter than'.
• Compare and describe the mass of two objects using the vocabulary 'heavy', 'light', 'heavier than', and 'lighter than'.

Lesson summary

This lesson introduces Grade R learners to the foundational concepts of measurement, specifically focusing on length (long/short) and mass (heavy/light). In the context of the South African CAPS curriculum, this topic is approached through informal, hands-on activities. Understanding these concepts is crucial for young learners as it forms the basis for all future mathematical learning in measurement.

Lesson notes

This section provides the core knowledge for the teacher. These concepts should be taught through play, songs, and hands-on exploration.

Concept 1: Length (How long is it?)

Explanation: Length is a measure of how long something is from one end to the other. For Grade R learners, this is a visual and tactile concept. They learn about length by directly comparing objects. It's crucial to place objects side-by-side, starting at the same baseline, to make a fair comparison.

Long: Describes an object that has a greater length.

Short: Describes an object that has a smaller length.

Longer than / Shorter than: These are comparative terms used when directly comparing two objects.

Why it matters: Understanding length helps children describe their world, follow instructions (e.g., "draw a long line"), and solve simple problems (e.g., "Will this plank fit across the puddle?").

Worked example

Example 1: Comparing Pencils

Teacher: (Holds up a new, unsharpened pencil and a small, used pencil). "Look at my two pencils. We want to see which one is long and which one is short."

Step 1: Place both pencils on the table next to each other. Make sure their ends are lined up perfectly. "See, I am making them start at the same place."

Step 2: Look at where the pencils end. "This pencil (the new one) goes on and on. It is long. This other pencil (the used one) stops here. It is short."

Step 3: Use comparative language. "The long pencil is longer than the short pencil. The short pencil is shorter than the long pencil."

Example 2: Playdough Snakes

Teacher: "Let's all take some playdough and roll a snake."

Step 1: After everyone has a snake, the teacher asks two learners, Sipho and Lerato, to bring their snakes to the front. "Sipho, put your snake here. Lerato, put your snake next to Sipho's. Let's make them start at the same line."

Step 2: The class observes. "Whose snake is longer? Yes, Lerato's snake is longer than Sipho's snake. That means Sipho's snake is shorter than Lerato's snake."

Concept 2: Mass (How heavy is it?)

Explanation:

Mass is the measure of how much 'stuff' is in an object. For Grade R learners, this is experienced as 'heaviness'. The most accessible tool for them is their own body. They can feel the downward pull of an object in their hands. This kinaesthetic experience is key.

Heavy: Describes an object that is difficult to lift or feels like it pushes your hand down a lot.

Light: Describes an object that is easy to lift or feels like it hardly pushes your hand down at all.

Heavier than / Lighter than: These are comparative terms used when directly comparing the feel of two objects.

Why it matters: Understanding mass helps with safety (not trying to lift things that are too heavy), problem-solving (packing a bag so it's not too heavy), and understanding the properties of different materials.

Worked

Examples:

Example 1: The Rock and the Leaf

Teacher: (Holds up a small stone/rock and a large leaf). "I have a rock from our playground and a leaf from the tree. Which one do you think is heavy and which is light?"

Step 1: The teacher places the rock in one hand and the leaf in the other, moving her hands up and down slightly like a balance scale. "Feel this. The rock pushes my hand down. It is heavy. The leaf is so easy to hold. It is light."

Step 2: Invite a learner to come and try. "Come, Thabo, you hold them. What do you feel?"

Step 3: Use comparative language. "The rock is heavier than the leaf. The leaf is lighter than the rock."

Example 2: The Book and the Crayon

Teacher: "Let's compare your big reading book and one crayon."

Step 1: "Hold your book in this hand. Now hold the crayon in your other hand. Close your eyes and feel."

Step 2: "Which one is pulling your hand down more? Yes, the book! The book is heavy. The crayon is very easy to hold. The crayon is light."

Step 3: "So, we can say the book is heavier than the crayon."

Guided Practice (With Solutions)