When you ask "What number is halfway between 78 and 155?" 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=155.
To find the number halfway between 78 and 155, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 78 and 155 into our formula, we get:
(78 + 155)/2 = 116.5
Thus, the number halfway between 78 and 155 is 116.5.
To check that our answer is correct, we subtract 78 from 116.5 and subtract 116.5 from 155 and compare the two numbers:
116.5 - 78 = 38.5
155 - 116.5 = 38.5
As you can see, the halfway number is 38.5 higher than 78 and 38.5 lower than 155. Therefore, our halfway between answer of 116.5 above is correct.
Halfway Between
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Halfway Between 78 and 156
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