It is (10+2)/2 = 6
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The halfway point between two numbers is found by calculating the average of the two numbers. In this case, the average of -20 and 10 is (-20 + 10) / 2 = -10 / 2 = -5. Therefore, the number halfway between -20 and 10 is -5.
It is (5 + 10)/2 = 15/2 = 7.5
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.
It is the number halfway between them or the number got when you add them and divide by 2. So for 7 and 10, the number 8.5 is the median.
19*******************************(10 + 19 = 29) 29 / 2 = 14.5