Chapter 6 of the Class 4 Maths textbook Math Mela is Measuring Length. It covers the standard units of length — millimetres, centimetres, metres, and kilometres — and how to measure and convert between them.
Units of Length
Q: Name the standard units used to measure length, from smallest to largest.
A: Millimetre (mm), centimetre (cm), metre (m), and kilometre (km), in increasing order of size.
Converting Between Units
Q: How many centimetres make 1 metre? How many metres make 1 kilometre?
A: 100 centimetres make 1 metre, and 1,000 metres make 1 kilometre.
Choosing the Right Unit
Q: Which unit would you use to measure the length of a pencil, and which for the distance between two cities?
A: A pencil’s length is measured in centimetres (cm), since it is small; the distance between two cities is measured in kilometres (km), since it is very large.
Using a Measuring Tool
Q: What tool is commonly used to measure the length of a notebook, and how should it be placed?
A: A ruler (scale) is used. It should be placed so that the “0” mark lines up exactly with one end of the notebook, and the reading is taken at the other end.
Frequently Asked Questions
What is the standard unit for measuring long distances?
The kilometre (km).
Why do we need standard units of measurement?
So that measurements taken by different people, in different places, can be compared accurately and mean the same thing everywhere.
Class 4 Mathematics Chapter 6 – Notes and Extra Questions
Along with these NCERT Solutions, students can also use the Class 4 Mathematics Chapter 6 Extra Questions and Class 4 Mathematics Chapter 6 Revision Notes for quick revision and extra practice.
