
When you ask "What number is halfway between 90 and 187?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=90 and Y=187.

To find the number halfway between 90 and 187, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 90 and 187 into our formula, we get:
(90 + 187)/2 = 138.5
Thus, the number halfway between 90 and 187 is 138.5.
To check that our answer is correct, we subtract 90 from 138.5 and subtract 138.5 from 187 and compare the two numbers:
138.5 - 90 = 48.5
187 - 138.5 = 48.5
As you can see, the halfway number is 48.5 higher than 90 and 48.5 lower than 187. Therefore, our halfway between answer of 138.5 above is correct.
Halfway Between
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Halfway Between 90 and 188
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