When you ask "What number is halfway between 78 and 276?" 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=276.
To find the number halfway between 78 and 276, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 78 and 276 into our formula, we get:
(78 + 276)/2 = 177
Thus, the number halfway between 78 and 276 is 177.
To check that our answer is correct, we subtract 78 from 177 and subtract 177 from 276 and compare the two numbers:
177 - 78 = 99
276 - 177 = 99
As you can see, the halfway number is 99 higher than 78 and 99 lower than 276. Therefore, our halfway between answer of 177 above is correct.
Halfway Between
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Halfway Between 78 and 277
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