When you ask "What number is halfway between 20 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=20 and Y=187.
To find the number halfway between 20 and 187, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 20 and 187 into our formula, we get:
(20 + 187)/2 = 103.5
Thus, the number halfway between 20 and 187 is 103.5.
To check that our answer is correct, we subtract 20 from 103.5 and subtract 103.5 from 187 and compare the two numbers:
103.5 - 20 = 83.5
187 - 103.5 = 83.5
As you can see, the halfway number is 83.5 higher than 20 and 83.5 lower than 187. Therefore, our halfway between answer of 103.5 above is correct.
Halfway Between
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Halfway Between 20 and 188
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