When you ask "What number is halfway between 15 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=15 and Y=276.
To find the number halfway between 15 and 276, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 15 and 276 into our formula, we get:
(15 + 276)/2 = 145.5
Thus, the number halfway between 15 and 276 is 145.5.
To check that our answer is correct, we subtract 15 from 145.5 and subtract 145.5 from 276 and compare the two numbers:
145.5 - 15 = 130.5
276 - 145.5 = 130.5
As you can see, the halfway number is 130.5 higher than 15 and 130.5 lower than 276. Therefore, our halfway between answer of 145.5 above is correct.
Halfway Between
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Halfway Between 15 and 277
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