When you ask "What number is halfway between 81 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=81 and Y=518.
To find the number halfway between 81 and 518, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 81 and 518 into our formula, we get:
(81 + 518)/2 = 299.5
Thus, the number halfway between 81 and 518 is 299.5.
To check that our answer is correct, we subtract 81 from 299.5 and subtract 299.5 from 518 and compare the two numbers:
299.5 - 81 = 218.5
518 - 299.5 = 218.5
As you can see, the halfway number is 218.5 higher than 81 and 218.5 lower than 518. Therefore, our halfway between answer of 299.5 above is correct.
Halfway Between
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Halfway Between 81 and 519
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