When you ask "What number is halfway between 87 and 130?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=87 and Y=130.
To find the number halfway between 87 and 130, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 87 and 130 into our formula, we get:
(87 + 130)/2 = 108.5
Thus, the number halfway between 87 and 130 is 108.5.
To check that our answer is correct, we subtract 87 from 108.5 and subtract 108.5 from 130 and compare the two numbers:
108.5 - 87 = 21.5
130 - 108.5 = 21.5
As you can see, the halfway number is 21.5 higher than 87 and 21.5 lower than 130. Therefore, our halfway between answer of 108.5 above is correct.
Halfway Between
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Halfway Between 87 and 131
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