Class 3 Maths - ICSE
Measurement – Length
In the Class 3 ICSE Mathematics chapter on Measurement of Length, students learn how to measure objects using standard units like centimetres (cm), metres (m), and kilometres (km). Young learners discover how to choose the right tool for measuring, such as a ruler for a pencil or a measuring tape for a room. They also practice converting metres to centimetres and adding or subtracting lengths with and without regrouping. This chapter forms the foundation for practical geometry and measurement skills. In ICSE board exams, it carries around 4 to 6 marks, featuring direct conversion sums and word problems.
Start Learning FreeKey Concepts
Standard Units of Length
We use centimetres (cm) to measure small objects, metres (m) for larger things like room length, and kilometres (km) for very long distances between places.
Conversion of Metres to Centimetres
Since 1 metre is equal to 100 centimetres, we multiply the number of metres by 100 to convert metres into centimetres.
Conversion of Centimetres to Metres
To convert centimetres into metres and centimetres, we split the given number into hundreds and ones, where the hundreds place represents metres.
Addition of Lengths
Lengths in centimetres are added together just like normal numbers, and metres are added separately, carrying over when the sum of centimetres reaches 100.
Subtraction of Lengths
We subtract smaller lengths from larger lengths by subtracting centimetres first and then metres, borrowing 1 metre (100 cm) when needed.
Important Formulas
Board Exam Info
In ICSE Class 3 Mathematics assessments, this chapter typically carries 4 to 6 marks. Common question types include unit conversions (m to cm), simple addition and subtraction word problems involving length, and choosing the appropriate unit for measuring specific objects.
Frequently Asked Questions
When should I use cm and when should I use m?
Use centimetres (cm) for short objects like a book or pencil, and metres (m) for longer objects like a bed or the height of a door.
How do I convert metres into centimetres?
To convert metres into centimetres, simply multiply the number of metres by 100 by adding two zeros to the end.
Do I need to write the units in my final answer during exams?
Yes! Always write the correct unit (like cm, m, or km) next to your final answer, otherwise marks may be deducted.
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