Lesson Notes By Weeks and Term v5 - Grade R

Lesson Video

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Performance objectives

• Describe objects as 'long' or 'short'
• Compare the length of objects
• Describe objects as 'heavy' or 'light'
• Compare the mass of objects
• Use new words: long, short, heavy, and light

Lesson summary

This week, we are going to explore the fascinating world of measurement! Measurement helps us understand the size and weight of things around us. We'll learn about length – whether something is long or short – and mass – whether something is heavy or light. These are important skills because they help us compare objects, understand our environment, and even help with tasks like cooking and building! Imagine trying to share sweets fairly if you didn't know which packet was heavier!

Lesson notes

Length: Long and Short Length tells us how far something extends from one end to the other. We use words like "long" and "short" to describe the length of objects.

Long: Something that extends for a considerable distance is long. Think of a very tall tree or a long road.

Short: Something that doesn't extend very far is short. Think of a small pencil or a short piece of string. To compare lengths, we place the objects side by side, starting at the same point. The object that extends further is longer.

Example 1: Imagine we have two pencils: a red pencil and a blue pencil. We put them side by side, making sure their ends are aligned (start at the same spot). If the red pencil sticks out further than the blue pencil, we say the red pencil is longer and the blue pencil is shorter.

Example 2: Think about a snake and a worm. A snake is usually much longer than a worm.

Therefore, we can say a snake is long and a worm is short, when compared to each other.

Mass: Heavy and Light Mass tells us how much "stuff" is inside an object. We often call this weight. We use the words "heavy" and "light" to describe the mass of objects.

Heavy: Something that takes a lot of effort to lift is heavy. Think of a big rock or a bag full of potatoes.

Light: Something that doesn't take much effort to lift is light. Think of a feather or an empty plastic cup. To compare mass, we can hold one object in each hand. The object that feels heavier is actually heavier!

Example 1: Imagine we have a small stone and a large feather. Even though the stone is smaller, it will feel much heavier than the feather when we hold them. So, the stone is heavy and the feather is light.

Example 2: Think about a soccer ball and a balloon. The soccer ball is filled with air and material and is heavier than an empty balloon. The soccer ball is heavy, and the balloon is light. Important

Note: We are making comparisons. Something can be "long" compared to one thing, but "short" compared to another. The same applies to "heavy" and "light". Guided Practice (With Solutions)

Question 1: Look at these two crayons. Which one is longer? (Image: A long green crayon and a short yellow crayon)

Solution: The green crayon is longer than the yellow crayon. We can tell this by looking at them. The green crayon extends further.

Commentary: This question focuses on visual comparison. It reinforces the meaning of "longer".

Question 2: I have a big book and a small book. Which one is likely to be heavier? (Assume: The books are made of the same type of material.)

Solution: The big book is likely to be heavier. Generally, larger objects made of the same materials have more mass.

Commentary: This question encourages thinking about the relationship between size and mass. We're guiding them to understand that generally larger = heavier, but emphasizing it's likely based on common experience.

Question 3: Nomusa has a pencil and a ruler. The pencil is shorter than the ruler. Which is longer?

Solution: The ruler is longer than the pencil.

Commentary: This question uses language to indirectly compare lengths, reinforcing understanding.

Question 4: Thabo has a feather and a rock. Which one is lighter?

Solution: The feather is lighter than the rock.

Commentary: This question is straightforward to reinforce light versus heavy understanding. Independent Practice (Questions Only) Draw a picture of a long snake and a short worm. Find two sticks outside. Which one is longer? Which one is shorter? Find a heavy object in your classroom or home. Then find a light object. Draw a picture of each and label them "heavy" and "light". You have a bag of feathers and a single brick. Which is heavier? Why? (Think carefully!) Sarah has a long skipping rope, and John has a short skipping rope. Who has the longer skipping rope? Imagine you have a teddy bear and a real baby elephant. Which is heavier? Draw a long train and a short train. Find two books. Put them side by side. Which is longer? Which is shorter?