When you ask "What number is halfway between 78 and 153?" 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=153.
To find the number halfway between 78 and 153, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 78 and 153 into our formula, we get:
(78 + 153)/2 = 115.5
Thus, the number halfway between 78 and 153 is 115.5.
To check that our answer is correct, we subtract 78 from 115.5 and subtract 115.5 from 153 and compare the two numbers:
115.5 - 78 = 37.5
153 - 115.5 = 37.5
As you can see, the halfway number is 37.5 higher than 78 and 37.5 lower than 153. Therefore, our halfway between answer of 115.5 above is correct.
Halfway Between
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Halfway Between 78 and 154
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