CBSE 10 Math · U1

Number Systems

CBSE Class 10 Mathematics Unit I: Fundamental Theorem of Arithmetic, HCF-LCM applications, prime-power reasoning, and algebraic proofs of irrationality.

Test yourself

A focused, distraction-free run through 33 multiple-choice questions. Hints if you need them; your score at the end.

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Difficulty guide

The label describes the problem, not your ability.

1/5 - Foundational

Warm-up setup; checks one basic idea.

2/5 - Routine exam skill

Normal syllabus skill; usually one main rule or interpretation.

3/5 - Standard multi-step

Exam-style problem with multiple steps or a common trap.

4/5 - Hard exam skill

High-end exam problem; combines methods carefully.

5/5 - Challenge

Stretch problem beyond normal exam pressure.

Topic 1.1

Prime Factorisation and HCF-LCM

Fundamental Theorem of Arithmetic, prime powers, HCF and LCM by factorisation.

Topic 1.2

Applications of the Fundamental Theorem

Least common multiples, greatest common factors, square conditions, and divisibility arguments.

Topic 1.3

Irrationality Proofs

Algebraic proofs of irrationality for square roots and related surd expressions.

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