When you ask "What number is halfway between 15 and 138?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=15 and Y=138.
To find the number halfway between 15 and 138, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 15 and 138 into our formula, we get:
(15 + 138)/2 = 76.5
Thus, the number halfway between 15 and 138 is 76.5.
To check that our answer is correct, we subtract 15 from 76.5 and subtract 76.5 from 138 and compare the two numbers:
76.5 - 15 = 61.5
138 - 76.5 = 61.5
As you can see, the halfway number is 61.5 higher than 15 and 61.5 lower than 138. Therefore, our halfway between answer of 76.5 above is correct.
Halfway Between
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Halfway Between 15 and 139
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