When you ask "What number is halfway between 84 and 115?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=84 and Y=115.
To find the number halfway between 84 and 115, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 84 and 115 into our formula, we get:
(84 + 115)/2 = 99.5
Thus, the number halfway between 84 and 115 is 99.5.
To check that our answer is correct, we subtract 84 from 99.5 and subtract 99.5 from 115 and compare the two numbers:
99.5 - 84 = 15.5
115 - 99.5 = 15.5
As you can see, the halfway number is 15.5 higher than 84 and 15.5 lower than 115. Therefore, our halfway between answer of 99.5 above is correct.
Halfway Between
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Halfway Between 84 and 116
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