
When you ask "What number is halfway between 15 and 544?" 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=544.

To find the number halfway between 15 and 544, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 15 and 544 into our formula, we get:
(15 + 544)/2 = 279.5
Thus, the number halfway between 15 and 544 is 279.5.
To check that our answer is correct, we subtract 15 from 279.5 and subtract 279.5 from 544 and compare the two numbers:
279.5 - 15 = 264.5
544 - 279.5 = 264.5
As you can see, the halfway number is 264.5 higher than 15 and 264.5 lower than 544. Therefore, our halfway between answer of 279.5 above is correct.
Halfway Between
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Halfway Between 15 and 545
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