When you ask "What number is halfway between 68 and 489?" 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=489.
To find the number halfway between 68 and 489, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 68 and 489 into our formula, we get:
(68 + 489)/2 = 278.5
Thus, the number halfway between 68 and 489 is 278.5.
To check that our answer is correct, we subtract 68 from 278.5 and subtract 278.5 from 489 and compare the two numbers:
278.5 - 68 = 210.5
489 - 278.5 = 210.5
As you can see, the halfway number is 210.5 higher than 68 and 210.5 lower than 489. Therefore, our halfway between answer of 278.5 above is correct.
Halfway Between
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Halfway Between 68 and 490
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