
When you ask "What number is halfway between 15 and 534?" 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=534.

To find the number halfway between 15 and 534, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 15 and 534 into our formula, we get:
(15 + 534)/2 = 274.5
Thus, the number halfway between 15 and 534 is 274.5.
To check that our answer is correct, we subtract 15 from 274.5 and subtract 274.5 from 534 and compare the two numbers:
274.5 - 15 = 259.5
534 - 274.5 = 259.5
As you can see, the halfway number is 259.5 higher than 15 and 259.5 lower than 534. Therefore, our halfway between answer of 274.5 above is correct.
Halfway Between
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Halfway Between 15 and 535
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