When you ask "What number is halfway between 7 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=7 and Y=518.
To find the number halfway between 7 and 518, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 7 and 518 into our formula, we get:
(7 + 518)/2 = 262.5
Thus, the number halfway between 7 and 518 is 262.5.
To check that our answer is correct, we subtract 7 from 262.5 and subtract 262.5 from 518 and compare the two numbers:
262.5 - 7 = 255.5
518 - 262.5 = 255.5
As you can see, the halfway number is 255.5 higher than 7 and 255.5 lower than 518. Therefore, our halfway between answer of 262.5 above is correct.
Halfway Between
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Halfway Between 7 and 519
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