When you ask "What number is halfway between 15 and 538?" 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=538.
To find the number halfway between 15 and 538, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 15 and 538 into our formula, we get:
(15 + 538)/2 = 276.5
Thus, the number halfway between 15 and 538 is 276.5.
To check that our answer is correct, we subtract 15 from 276.5 and subtract 276.5 from 538 and compare the two numbers:
276.5 - 15 = 261.5
538 - 276.5 = 261.5
As you can see, the halfway number is 261.5 higher than 15 and 261.5 lower than 538. Therefore, our halfway between answer of 276.5 above is correct.
Halfway Between
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Halfway Between 15 and 539
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