Lesson Notes By Weeks and Term v5 - Grade 2
Measurement: length, mass and capacity (Grade 2) – Week 5 focus
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Measurement: length, mass and capacity (Grade 2) – Week 5 focus
Download the Lessonotes Mobile South Africa app for faster lesson access on Android and iPhone.
Subject: Mathematics
Class: Grade 2
Term: 3rd Term
Week: 5
Theme: General lesson support
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This week, we're diving into the exciting world of measurement! We'll be exploring length, mass, and capacity, which are all around us in our everyday lives in South Africa. Imagine you're helping your mom bake vetkoek – you need to measure the flour (mass), the cooking oil (capacity), and maybe even how long to cut the dough pieces (length). Or think about building a sandcastle at the beach; you need to know the length of the castle, the mass of the sand, and the capacity of your bucket. Understanding measurement helps us describe and compare things in a more accurate and useful way. It’s not just about numbers; it's about understanding the world around us!
Length: Length tells us how long something is. We can measure length using different things. This week, we'll use non-standard units, meaning things that aren’t rulers or measuring tapes, like our hands, feet, or pencils.
Example 1:* If we want to know how long the classroom chalkboard is, we could use our hands. We could lay our hands end-to-end along the chalkboard and count how many hands it takes to reach the end. If it takes 15 hands, we can say the chalkboard is about 15 hands long.
Example 2:* To measure the length of your desk, you could use your pencil. Lay the pencil along the desk repeatedly, marking where the pencil ends each time. Count how many pencils it takes to reach the other side. Important
Note: The measurement will be different if people use different sized hands or pencils! This is why eventually we will use standard units like meters and centimeters, but for now, we are getting used to the idea of measuring.
Mass: Mass tells us how heavy something is. We can compare the mass of two objects by holding them, using a balance scale, or even just by guessing!
Example 1: Imagine you have a cricket ball in one hand and a tennis ball in the other. Which feels heavier? The cricket ball has more mass – it's heavier. We say the cricket ball is heavier than the tennis ball, and the tennis ball is lighter than the cricket ball.
Example 2: Let’s compare a textbook and a notebook. If you lift them both, the textbook likely feels heavier. So, the textbook has more mass than the notebook.
Example 3: If you hold two identical apples, they will probably feel about the same weight. They have about the same mass.
Capacity: Capacity tells us how much something can hold. We usually talk about capacity when we're talking about containers like bottles, cups, buckets, and jugs. We compare capacity using words like "more than," "less than," and "equal to." Example 1: If you have a small teacup and a big mug, the mug can hold more water than the teacup. The teacup has less capacity than the mug.
Example 2: Imagine you have two identical glasses. If you fill both of them with water to the top, they will both hold the same amount. They have equal capacity.
Example 3: You have a bucket and a watering can. The bucket probably holds more water than the watering can. The watering can holds less water than the bucket. Guided Practice (With Solutions)
Question 1: Use your foot to measure the length of your classroom door. How many feet long is it?
Solution: Lay your foot down from the edge of the door to the other. Mark where your foot ends and repeat. Keep counting until you reach the other side of the door. Let's say it took 8 of your feet. Then, the door is approximately 8 feet long.
Commentary: This helps learners understand length using a non-standard unit that is readily available.* Question 2: Compare the mass of your lunch box and your pencil case. Which is heavier?
Solution: Pick up your lunch box in one hand and your pencil case in the other. Which one feels heavier? Let's say your lunch box feels heavier.
You can say: "My lunch box is heavier than my pencil case," or "My pencil case is lighter than my lunch box."
Commentary: This reinforces the concept of comparing mass through direct comparison.* Question 3: You have a glass of water and a jug of water. Which one can hold more water?
Solution: The jug can hold more water. We can say, "The jug has a larger capacity than the glass."
Commentary: Helps learners understand the practical application of capacity in everyday scenarios.* Question 4: Use your pencil to measure the length of your math book. How many pencils long is it?
Solution: Lay your pencil end to end along the math book. Count how many pencils it takes to reach the end. For example, if it takes 2 and a half pencils, you can say the math book is about 2 and a half pencils long.
Commentary: Introduces the idea of fractional measurements with non-standard units.* Independent Practice (Questions Only) Use your hand to measure the width of your desk. How many hands wide is it? Find three objects in the classroom. Order them from lightest to heaviest. You have a bottle of juice and a cup. Which holds more juice? Use your shoe to measure the length of your carpet in your house. Compare the mass of an apple and an orange. Which is heavier? You have a small bowl and a large pot. Which can hold more water? Use your thumb to measure the length of your eraser. Compare the mass of your eraser and your pencil. You have a mug and a flask. Which can hold more liquid? Arrange three objects in your house from objects which can hold the least water to the most.