When you ask "What number is halfway between 57 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=57 and Y=138.
To find the number halfway between 57 and 138, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 57 and 138 into our formula, we get:
(57 + 138)/2 = 97.5
Thus, the number halfway between 57 and 138 is 97.5.
To check that our answer is correct, we subtract 57 from 97.5 and subtract 97.5 from 138 and compare the two numbers:
97.5 - 57 = 40.5
138 - 97.5 = 40.5
As you can see, the halfway number is 40.5 higher than 57 and 40.5 lower than 138. Therefore, our halfway between answer of 97.5 above is correct.
Halfway Between
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Halfway Between 57 and 139
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