Mathematics · Class 4
Long and Short
Learn Long and Short with notes, examples, and practice questions.
3 sections15–25 min read3 MCQs · 1 examples
Chapter Overview
10 millimetres = 1 centimetre, 100 centimetres = 1 metre, and 1000 metres = 1 kilometre.
Long and Short introduces standard units of length and sensible measurement. Learners choose millimetres, centimetres, metres, or kilometres, use rulers correctly, and convert between centimetres and metres.
Choosing a Unit
- Millimetres measure very small lengths such as coin thickness.
- Centimetres suit a pencil or notebook.
- Metres suit room length or a person's height.
- Kilometres measure long distances between places.
Measuring and Converting
- Place the ruler's zero mark at the object's starting edge.
- If an object begins at another mark, subtract the start reading from the end reading.
- Convert metres to centimetres by multiplying by 100.
- Write measurements with both a number and a unit.
Solved Examples
Step-by-step solutions — read each step before checking the final answer.
Find a Ribbon's Length
A ribbon starts at 3 cm and ends at 18 cm on a ruler. How long is it?
- 1Read the end mark: 18 cm.
- 2Read the start mark: 3 cm.
- 3Subtract 18 − 3 = 15.
Answer
15 cm
Key Points to Remember
- ✓ Use standard units for fair comparison
- ✓ Begin measuring at zero when possible
- ✓ Length equals end reading minus start reading
- ✓ Choose a unit that matches the size
Exam Tips
- • Include the correct unit in every answer
- • Do not count ruler marks; subtract readings
- • Convert both measurements to the same unit before comparing
Practice MCQs — Long and Short
Test your understanding with topic-wise multiple choice questions. Explanations appear after each answer.
Question 1 of 3Score: 0/0
Which unit best measures the distance between two towns?