When you ask "What number is halfway between 84 and 151?" 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=151.
To find the number halfway between 84 and 151, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 84 and 151 into our formula, we get:
(84 + 151)/2 = 117.5
Thus, the number halfway between 84 and 151 is 117.5.
To check that our answer is correct, we subtract 84 from 117.5 and subtract 117.5 from 151 and compare the two numbers:
117.5 - 84 = 33.5
151 - 117.5 = 33.5
As you can see, the halfway number is 33.5 higher than 84 and 33.5 lower than 151. Therefore, our halfway between answer of 117.5 above is correct.
Halfway Between
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Halfway Between 84 and 152
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