When you ask "What number is halfway between 78 and 149?" 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=149.
To find the number halfway between 78 and 149, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 78 and 149 into our formula, we get:
(78 + 149)/2 = 113.5
Thus, the number halfway between 78 and 149 is 113.5.
To check that our answer is correct, we subtract 78 from 113.5 and subtract 113.5 from 149 and compare the two numbers:
113.5 - 78 = 35.5
149 - 113.5 = 35.5
As you can see, the halfway number is 35.5 higher than 78 and 35.5 lower than 149. Therefore, our halfway between answer of 113.5 above is correct.
Halfway Between
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Halfway Between 78 and 150
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