Скачать или смотреть Exercise 1B Class 6 Countdown Oxford || Class 6 Math Countdown || Q No. 01 || Step by Step Solution

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Exercise 1B of the New Countdown Book 6 (Third Edition) focuses on the concept of sets, an essential topic in mathematics. This exercise helps students understand set representation, including tabular form (roster notation) and set-builder form.

Key Concepts Covered:

1. Definition of Sets – Understanding what a set is and how it groups distinct objects.


2. Tabular Form (Roster Notation) – Listing all elements of a set within curly brackets {}.

Example: The set of prime numbers less than 10: {2, 3, 5, 7}.



3. Set-Builder Form – Representing sets using properties of elements.

Example: {x | x is a prime number less than 10}.



4. Identifying Elements of a Set – Checking whether a given object belongs to a set.


5. Converting Between Forms – Writing sets in both roster and set-builder notation.



Exercise Objectives:

Improve logical thinking by classifying elements into sets.

Strengthen understanding of mathematical notation.

Develop skills in set description and conversion.


This exercise is a fundamental part of Class 6 Mathematics, helping students build a strong foundation in set theory.

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