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It is: 18
The GCF is 9.
Factors of 24: 1,2,3,4,6,8,12 and 24. Factors of 90: 1,2,3,5,9,10,18,30,45 and 90. The HCF (highest common factor) is 3.
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
The greatest common factor is the highest number that divides exactly into two or more numbers. 15: 1, 3, 5, 15 90: 1, 2, 3, 5, 6, 9, 10, 15, 18, 30, 45, 90 The GCF for 15 and 90 is 15.