When you ask "What number is halfway between 84 and 87?" 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=87.
To find the number halfway between 84 and 87, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 84 and 87 into our formula, we get:
(84 + 87)/2 = 85.5
Thus, the number halfway between 84 and 87 is 85.5.
To check that our answer is correct, we subtract 84 from 85.5 and subtract 85.5 from 87 and compare the two numbers:
85.5 - 84 = 1.5
87 - 85.5 = 1.5
As you can see, the halfway number is 1.5 higher than 84 and 1.5 lower than 87. Therefore, our halfway between answer of 85.5 above is correct.
Halfway Between
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Halfway Between 84 and 88
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