All of the positive whole-number factors are 1, 2, 4, 8, 16, 32, 64, 128, and 256.
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1 x (2)8
Take your pick: 1 x 256 = 256 2 x 128 = 256 4 x 64 = 128 8 x 32 = 256 16 x 16 = 256 (Also, for each pair of factors above, they can be both negative, eg -4 x -64 = 256.)
No, 256 is not a composite number. It is a power of 2, specifically 2 to the power of 8 (2^8), and only has 2 factors (1 and 256), making it a prime number.
The factors of 1280 are: 1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 128, 160, 256, 320, 640, 1280.
The greatest common factor (GCF) of two numbers is the largest number that divides both numbers without leaving a remainder. To find the GCF of 81 and 256, you can use prime factorization. Prime factorizing 81 gives you 3^4, and prime factorizing 256 gives you 2^8. The common factors between 81 and 256 are 1, 3, and 9. Therefore, the GCF of 81 and 256 is 9.