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To find the highest common factor (HCF) of 81, 243, and 1215, we first need to find the prime factorization of each number. The prime factorization of 81 is 3^4, 243 is 3^5, and 1215 is 3^5 * 5. To find the HCF, we look for the highest power of each prime factor that appears in all the numbers. In this case, the highest power of 3 that appears in all three numbers is 3^4, so the HCF of 81, 243, and 1215 is 81.

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Tashya Saraogi

Lvl 2
3y ago

81

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Wiki User

11y ago

81

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Wiki User

8y ago

It is: 81

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Q: What is the HCF of 81 243 and 1215?
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