When you ask "What number is halfway between 88 and 517?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=88 and Y=517.
To find the number halfway between 88 and 517, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 88 and 517 into our formula, we get:
(88 + 517)/2 = 302.5
Thus, the number halfway between 88 and 517 is 302.5.
To check that our answer is correct, we subtract 88 from 302.5 and subtract 302.5 from 517 and compare the two numbers:
302.5 - 88 = 214.5
517 - 302.5 = 214.5
As you can see, the halfway number is 214.5 higher than 88 and 214.5 lower than 517. Therefore, our halfway between answer of 302.5 above is correct.
Halfway Between
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Halfway Between 88 and 518
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