When you ask "What number is halfway between 15 and 530?" 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=530.
To find the number halfway between 15 and 530, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 15 and 530 into our formula, we get:
(15 + 530)/2 = 272.5
Thus, the number halfway between 15 and 530 is 272.5.
To check that our answer is correct, we subtract 15 from 272.5 and subtract 272.5 from 530 and compare the two numbers:
272.5 - 15 = 257.5
530 - 272.5 = 257.5
As you can see, the halfway number is 257.5 higher than 15 and 257.5 lower than 530. Therefore, our halfway between answer of 272.5 above is correct.
Halfway Between
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Halfway Between 15 and 531
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