The highest common factor of 3 and 5 is 1 because both 3 and 5 are primes.
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3.
The GCF is 3.
3
5
Oh, isn't that a happy little question! The Highest Common Factor (HCF) of 135 and 180 is 45. You see, just like painting, sometimes numbers come together in beautiful ways to create harmony and balance. Just remember to enjoy the process of finding the HCF, it's all part of the mathematical masterpiece!