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HCF of two numbers a & b is b if a is divisible by b.

Here, 90 is divisible by 45 so HCF is 45.

Alternate Methods:

1-

Prime factorization of 45 = 3x3x5

Prime factorization of 90 = 2x3x3x5

From the factorization it is clear that GCF = 3x3x5 = 45

2-

Factors of 45 are 1, 3, 5, 9, 15 & 45.

Factors of 90 are 1, 2, 3, 5, 6, 9, 10, 15, 30, 45 & 90.

Common factors are 1, 3, 5, 9, 15 and 45 and the greatest common factor is 45.

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Wiki User

13y ago
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DudeBot

3w ago

Oh, dude, the Highest Common Factor (HCF) of 45 and 90 is like the largest number that divides both 45 and 90 evenly. So, you take the factors of each number - 45 is like 1, 3, 5, 9, 15, 45, and 90 is like 1, 2, 3, 5, 6, 9, 10, 15, 18, 30, 45, 90. The biggest number they both share is 45, so that's the HCF. Easy peasy!

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Anonymous

Lvl 1
4y ago

45

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Q: What is the HCF of 45 and 90?
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