When you ask "What number is halfway between 15 and 562?" 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=562.
To find the number halfway between 15 and 562, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 15 and 562 into our formula, we get:
(15 + 562)/2 = 288.5
Thus, the number halfway between 15 and 562 is 288.5.
To check that our answer is correct, we subtract 15 from 288.5 and subtract 288.5 from 562 and compare the two numbers:
288.5 - 15 = 273.5
562 - 288.5 = 273.5
As you can see, the halfway number is 273.5 higher than 15 and 273.5 lower than 562. Therefore, our halfway between answer of 288.5 above is correct.
Halfway Between
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