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The factors of 105 are 3,5, & 7.
The factors of 63 are 3,3, & 7.
One lot of '3' and one lot of '7' is common to both numbers.
Hence 3 x 7 = 21 , which is the HCF of 105,& 63.
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63 and 84's highest common factor is 21.
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The greatest common factor (GCF) is often also called the greatest common divisor (GCD) or highest common factor (HCF). Keep in mind that these different terms all refer to the same thing: the largest integer which evenly divides two or more numbers.The greatest common factor of 63 and 90 is 9
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Highest commen factors 36 and 63?
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