When you ask "What number is halfway between 51 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=51 and Y=138.
To find the number halfway between 51 and 138, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 51 and 138 into our formula, we get:
(51 + 138)/2 = 94.5
Thus, the number halfway between 51 and 138 is 94.5.
To check that our answer is correct, we subtract 51 from 94.5 and subtract 94.5 from 138 and compare the two numbers:
94.5 - 51 = 43.5
138 - 94.5 = 43.5
As you can see, the halfway number is 43.5 higher than 51 and 43.5 lower than 138. Therefore, our halfway between answer of 94.5 above is correct.
Halfway Between
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Halfway Between 51 and 139
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