When you ask "What number is halfway between 66 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=66 and Y=489.
To find the number halfway between 66 and 489, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 66 and 489 into our formula, we get:
(66 + 489)/2 = 277.5
Thus, the number halfway between 66 and 489 is 277.5.
To check that our answer is correct, we subtract 66 from 277.5 and subtract 277.5 from 489 and compare the two numbers:
277.5 - 66 = 211.5
489 - 277.5 = 211.5
As you can see, the halfway number is 211.5 higher than 66 and 211.5 lower than 489. Therefore, our halfway between answer of 277.5 above is correct.
Halfway Between
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Halfway Between 66 and 490
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