NCERT Class 5 Mathematics Math-Magic: Chapter 14 — How Big? How Heavy?
This chapter, 'How Big? How Heavy?' from NCERT Class 5 Mathematics Math-Magic, introduces the concept of volume through practical activities. Students learn to estimate and measure the volume of objects by comparing how much water they displace. The chapter uses marbles as a unit of measurement, encouraging children to guess and then verify the volume of various items like coins, erasers, lemons, and pencils. It emphasizes hands-on learning, suggesting the creation of a personal measuring glass using marbles. The text highlights that understanding volume is more abstract than length or area, and provides guidance for teachers to facilitate this understanding through informal measurements and engaging activities, preparing students for formal units like litres and cubic centimetres.
Quick info
| Board | CBSE / NCERT |
|---|---|
| Class | Class 5 |
| Subject | Mathematics |
| Book | Math-Magic |
| Chapter | Chapter 14 — How Big? How Heavy? |
| Language | English |
| PDF type | NCERT Textbook |
| Session | CBSE 2026 |
| Reading time | 3 minutes |
| Word count | 406 |
Learning outcomes
- Estimate the volume of objects using marbles as a unit.
- Compare the volumes of different objects.
- Understand that an object's volume is the space it occupies.
- Create a simple measuring tool to gauge volume.
- Relate displacement of water to an object's volume.
Vocabulary
| Word | Meaning |
|---|---|
| Volume | The amount of space that a substance or object occupies, or that is enclosed within a container. |
| Displace | To move something from its usual or intended position. |
| Estimate | To roughly calculate or judge the value, size, amount, or extent of something. |
| Measure | To ascertain the size, amount, or degree of something by using an instrument or device. |
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Practice questions
- If 5 marbles raise the water level by a certain amount, how much would 10 marbles raise it? Answer: Twice the amount that 5 marbles raise it.
- Why does an object placed in water raise the water level? Answer: Because the object takes up space, which is its volume, and pushes the water aside.
- How can you make your own measuring glass? Answer: By using a glass of water and marking levels after adding a specific number of marbles (e.g., 5, 10, 15...).
- What is the difference between guessing and measuring volume? Answer: Guessing is an estimation, while measuring involves using a tool or method to find the actual amount of space an object occupies.
Frequently asked questions
What is the main concept taught in NCERT Class 5 Mathematics Chapter 200?
The chapter 'How Big? How Heavy?' introduces and teaches students about the concept of volume through estimation and informal measurement activities.
How can students measure volume in this chapter?
Students can measure volume by observing how much water an object displaces, using marbles as a unit of measurement, and by creating their own measuring glass.
What is the role of marbles in this chapter?
Marbles are used as a unit to estimate and measure the volume of various objects by observing the rise in water level when they are added to a glass.
Why is it important to compare volumes?
Comparing volumes helps students develop an intuitive understanding of how much space different objects occupy, which is a fundamental aspect of understanding volume.
What is the purpose of making a personal measuring glass?
Making a personal measuring glass allows students to practice measuring volume in a hands-on way, reinforcing the concept of volume units and measurement.
How does this chapter prepare students for formal volume measurement?
It builds a foundational understanding of volume through practical, relatable activities, making the transition to formal units like litres and cubic centimetres easier.
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Topics covered
NCERT Class 5 Mathematics — Math-Magic — Chapter 14 — How Big? How Heavy?. Verified by NCERT Help Editorial Team. Reviewed on 29 Jul 2026. Last updated 10 Aug 2026.