When you ask "What number is halfway between 100 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=100 and Y=187.
To find the number halfway between 100 and 187, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 100 and 187 into our formula, we get:
(100 + 187)/2 = 143.5
Thus, the number halfway between 100 and 187 is 143.5.
To check that our answer is correct, we subtract 100 from 143.5 and subtract 143.5 from 187 and compare the two numbers:
143.5 - 100 = 43.5
187 - 143.5 = 43.5
As you can see, the halfway number is 43.5 higher than 100 and 43.5 lower than 187. Therefore, our halfway between answer of 143.5 above is correct.
Halfway Between
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Halfway Between 100 and 188
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