Factors of 128 in pairs: 1 x 128, 2 x 64, 4 x 32, 8 x 16.
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they are all multiples of two and they are less than 100
64 times 2
They are: 1, 2, 4, 8, 16, 32, 64, 128, 256.
The two numbers that add to give you 18 and multiply to give you 40 are 10 and 8. This is because 10 + 8 = 18 and 10 x 8 = 80. However, if the question is referring to two numbers that add to 18 and multiply to 40, the correct pair would be 5 and 8, as 5 + 8 = 13 and 5 x 8 = 40.
It is not possible to give a sensible answer to this question. The highest common factor (HCF) refers to a factor that is COMMON to two or more numbers. You have only one number in the question!