When you ask "What number is halfway between 15 and 554?" 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=554.
To find the number halfway between 15 and 554, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 15 and 554 into our formula, we get:
(15 + 554)/2 = 284.5
Thus, the number halfway between 15 and 554 is 284.5.
To check that our answer is correct, we subtract 15 from 284.5 and subtract 284.5 from 554 and compare the two numbers:
284.5 - 15 = 269.5
554 - 284.5 = 269.5
As you can see, the halfway number is 269.5 higher than 15 and 269.5 lower than 554. Therefore, our halfway between answer of 284.5 above is correct.
Halfway Between
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Halfway Between 15 and 555
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