Find the HCF of the following numbers:
18, 54, 81

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Solution

HCF of two or more number is the highest number which divides the given numbers exactly.
Factors of 18 = $2 \times 3 \times 3$
Factors of 54 = $2 \times 3 \times 3 \times 3$
Factors of 81 = $3 \times 3 \times 3 \times 3$
HCF of 18, 54, and 81 = $3 \times 3 = 9$

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