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That's the number usually called the "average" of 150 and 250.It's 1/2 of the sum of the two numbers.1/2 (150 + 250) = 200.
The number that is halfway between one and one half (1½) and one (1) is one and one quarter (1¼)
There is no "the" rational" number since there is an infinity of them. Start with the number halfway between the two: (1/10+1/11)/2 = 21/220. Then try halfway between 1/10 and 21/220, and then halfway between 1/10 and that on. And so on.
If that's 0 and 12, halfway is 6/1 If that's 0 and 1/2, halfway is 1/4
Halfway between 1 and 4 is the midpoint, which can be calculated by adding the two numbers and dividing by 2. In this case, (1 + 4) / 2 = 2.5. Therefore, 2.5 is the number that is exactly halfway between 1 and 4.