When you ask "What number is halfway between 21 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=21 and Y=187.
To find the number halfway between 21 and 187, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 187 into our formula, we get:
(21 + 187)/2 = 104
Thus, the number halfway between 21 and 187 is 104.
To check that our answer is correct, we subtract 21 from 104 and subtract 104 from 187 and compare the two numbers:
104 - 21 = 83
187 - 104 = 83
As you can see, the halfway number is 83 higher than 21 and 83 lower than 187. Therefore, our halfway between answer of 104 above is correct.
Halfway Between
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Halfway Between 21 and 188
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