When you ask "What number is halfway between 51 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=51 and Y=518.
To find the number halfway between 51 and 518, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 51 and 518 into our formula, we get:
(51 + 518)/2 = 284.5
Thus, the number halfway between 51 and 518 is 284.5.
To check that our answer is correct, we subtract 51 from 284.5 and subtract 284.5 from 518 and compare the two numbers:
284.5 - 51 = 233.5
518 - 284.5 = 233.5
As you can see, the halfway number is 233.5 higher than 51 and 233.5 lower than 518. Therefore, our halfway between answer of 284.5 above is correct.
Halfway Between
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Halfway Between 51 and 519
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