When you ask "What number is halfway between 18 and 287?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=18 and Y=287.
To find the number halfway between 18 and 287, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 18 and 287 into our formula, we get:
(18 + 287)/2 = 152.5
Thus, the number halfway between 18 and 287 is 152.5.
To check that our answer is correct, we subtract 18 from 152.5 and subtract 152.5 from 287 and compare the two numbers:
152.5 - 18 = 134.5
287 - 152.5 = 134.5
As you can see, the halfway number is 134.5 higher than 18 and 134.5 lower than 287. Therefore, our halfway between answer of 152.5 above is correct.
Halfway Between
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Halfway Between 18 and 288
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