It is 16
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Hey the HCF is always found out between two numbers. The question is inappropriate or incomplete.
15
It is: 5
45. 180 = 22 x 32 x 5 225 = 32 x 52 hcf = 32 x 5 = 45
The highest common factor (HCF) of 256 and 640 is the largest number that divides both 256 and 640 without leaving a remainder. To find the HCF, we need to identify the common factors of both numbers. The factors of 256 are 1, 2, 4, 8, 16, 32, 64, 128, and 256, while the factors of 640 are 1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 80, 160, and 320. The highest common factor of 256 and 640 is 128.