When you ask "What number is halfway between 78 and 102?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=78 and Y=102.
To find the number halfway between 78 and 102, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 78 and 102 into our formula, we get:
(78 + 102)/2 = 90
Thus, the number halfway between 78 and 102 is 90.
To check that our answer is correct, we subtract 78 from 90 and subtract 90 from 102 and compare the two numbers:
90 - 78 = 12
102 - 90 = 12
As you can see, the halfway number is 12 higher than 78 and 12 lower than 102. Therefore, our halfway between answer of 90 above is correct.
Halfway Between
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Halfway Between 78 and 103
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