It is: 21
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7
The GCF is 2.
Oh, what a happy little question! The highest common factor (HCF) of 21, 42, and 84 is 21. You see, 21 is the largest number that can evenly divide all three of these numbers, creating a harmonious relationship between them. Just like adding a touch of white to a painting to bring all the colors together, finding the HCF helps us see the beautiful connection between these numbers.
It is 7
The Highest Common Factor (HCF) of 21, 77, and 84 is 7. To find the HCF, you need to identify the common factors of the numbers and determine the highest one they all share. In this case, the factors of 21 are 1, 3, 7, 21; the factors of 77 are 1, 7, 11, 77; and the factors of 84 are 1, 2, 3, 4, 6, 7, 12, 14, 21, 28, 42, 84. The highest common factor among them is 7.