When you ask "What number is halfway between 15 and 518?" 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=518.
To find the number halfway between 15 and 518, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 15 and 518 into our formula, we get:
(15 + 518)/2 = 266.5
Thus, the number halfway between 15 and 518 is 266.5.
To check that our answer is correct, we subtract 15 from 266.5 and subtract 266.5 from 518 and compare the two numbers:
266.5 - 15 = 251.5
518 - 266.5 = 251.5
As you can see, the halfway number is 251.5 higher than 15 and 251.5 lower than 518. Therefore, our halfway between answer of 266.5 above is correct.
Halfway Between
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Halfway Between 15 and 519
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