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Class 10MathematicsReal NumbersHCF and LCM using prime factorisationEasyLevel 12
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What is the HCF of (45) and (90)?

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Answer and explanation

Correct answer: (45)

Step 1: (45=3^2\times5) and (90=2\times3^2\times5). Step 2: All prime factors of (45) are present in (90). Step 3: Therefore, the HCF is (45).

Related tags

Real-NumbersHcfMultiple

Frequently asked questions

What is the correct answer to this question?

(45)

Why is this the correct answer?

Step 1: (45=3^2\times5) and (90=2\times3^2\times5). Step 2: All prime factors of (45) are present in (90). Step 3: Therefore, the HCF is (45).

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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  5. 5What is the LCM of (40) and (60)?
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