Mathematics · Class 4
How Heavy? How Light?
Learn How Heavy? How Light? with notes, examples, and practice questions.
3 sections15–25 min read3 MCQs · 1 examples
Chapter Overview
1000 grams = 1 kilogram; mass is measured with a balance, not by looking at size alone.
How Heavy? How Light? develops understanding of mass using grams and kilograms. Learners estimate, compare, read balance scales, convert units, and calculate the mass of combined objects.
Grams and Kilograms
- Grams suit light objects such as an eraser or spice packet.
- Kilograms suit heavier objects such as rice sacks or people.
- Convert kilograms to grams by multiplying by 1000.
- A large hollow object can be lighter than a small solid object.
Balances and Totals
- On a simple balance, the heavier side moves down.
- Equal levels show equal mass.
- Add masses only after converting to the same unit.
- Net mass is the mass of contents without the container.
Solved Examples
Step-by-step solutions — read each step before checking the final answer.
Add Two Masses
A parcel weighs 2 kg 350 g and another weighs 1 kg 800 g. What is their total mass?
- 1Add grams: 350 g + 800 g = 1150 g.
- 2Regroup 1150 g as 1 kg 150 g.
- 3Add kilograms: 2 + 1 + 1 = 4 kg.
Answer
4 kg 150 g
Key Points to Remember
- ✓ Mass compares how heavy objects are
- ✓ 1000 g equals 1 kg
- ✓ Use grams for light objects and kilograms for heavy ones
- ✓ Convert units before calculating
Exam Tips
- • Do not judge mass only by size
- • Regroup 1000 g as 1 kg
- • Read the labelled intervals on a scale
Practice MCQs — How Heavy? How Light?
Test your understanding with topic-wise multiple choice questions. Explanations appear after each answer.
Question 1 of 3Score: 0/0
Which unit best measures an apple's mass?