When you ask "What number is halfway between 72 and 505?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=72 and Y=505.
To find the number halfway between 72 and 505, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 72 and 505 into our formula, we get:
(72 + 505)/2 = 288.5
Thus, the number halfway between 72 and 505 is 288.5.
To check that our answer is correct, we subtract 72 from 288.5 and subtract 288.5 from 505 and compare the two numbers:
288.5 - 72 = 216.5
505 - 288.5 = 216.5
As you can see, the halfway number is 216.5 higher than 72 and 216.5 lower than 505. Therefore, our halfway between answer of 288.5 above is correct.
Halfway Between
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Halfway Between 72 and 506
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