65
85-45=40
40/2=20
45+20=65
85-20=65
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Halfway between 70 and 100 is (70 + 100) ÷ 2 = 85.
(50+120)/2 = 170/2 = 85
(70 + 100)/2 = 170/2 = 85
It is 88, the number halfway between the two middle numbers.
Oh, isn't that a happy little question? If we take a look between 80 and 85, we find the number 82 nestled right in the middle, like a little bird perched on a branch. It's a peaceful number, just waiting to be noticed and appreciated.