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Class 10MathematicsReal NumbersHCF and LCM using prime factorisationEasyLevel 11

What is the HCF of (20) and (30) using prime factorisation?

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Answer and explanation

Correct answer: (10)

Step 1: (20=2^2\times5) and (30=2\times3\times5). Step 2: The common prime factors are (2) and (5) with smaller powers (2) and (5). Step 3: (2\times5=10), so the HCF is (10).

Tags

real-numbershcfprime-factorisation

Frequently asked questions

What is the correct answer to this question?

(10)

Why is this the correct answer?

Step 1: (20=2^2\times5) and (30=2\times3\times5). Step 2: The common prime factors are (2) and (5) with smaller powers (2) and (5). Step 3: (2\times5=10), so the HCF is (10).

Which subject and chapter does this question cover?

This is a Class 10 Mathematics question. Chapter: Real Numbers. Topic: HCF and LCM using prime factorisation.

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