0.98
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0.75 ---------------the halfway number
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.
The number that is halfway between one and one half (1½) and one (1) is one and one quarter (1¼)
1
It is 25.5 which is the number halfway between them.