When you ask "What number is halfway between 31 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=31 and Y=138.
To find the number halfway between 31 and 138, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 31 and 138 into our formula, we get:
(31 + 138)/2 = 84.5
Thus, the number halfway between 31 and 138 is 84.5.
To check that our answer is correct, we subtract 31 from 84.5 and subtract 84.5 from 138 and compare the two numbers:
84.5 - 31 = 53.5
138 - 84.5 = 53.5
As you can see, the halfway number is 53.5 higher than 31 and 53.5 lower than 138. Therefore, our halfway between answer of 84.5 above is correct.
Halfway Between
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Halfway Between 31 and 139
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