When you ask "What number is halfway between 68 and 509?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=68 and Y=509.
To find the number halfway between 68 and 509, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 68 and 509 into our formula, we get:
(68 + 509)/2 = 288.5
Thus, the number halfway between 68 and 509 is 288.5.
To check that our answer is correct, we subtract 68 from 288.5 and subtract 288.5 from 509 and compare the two numbers:
288.5 - 68 = 220.5
509 - 288.5 = 220.5
As you can see, the halfway number is 220.5 higher than 68 and 220.5 lower than 509. Therefore, our halfway between answer of 288.5 above is correct.
Halfway Between
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Halfway Between 68 and 510
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