When you ask "What number is halfway between 12 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=12 and Y=489.
To find the number halfway between 12 and 489, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 12 and 489 into our formula, we get:
(12 + 489)/2 = 250.5
Thus, the number halfway between 12 and 489 is 250.5.
To check that our answer is correct, we subtract 12 from 250.5 and subtract 250.5 from 489 and compare the two numbers:
250.5 - 12 = 238.5
489 - 250.5 = 238.5
As you can see, the halfway number is 238.5 higher than 12 and 238.5 lower than 489. Therefore, our halfway between answer of 250.5 above is correct.
Halfway Between
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Halfway Between 12 and 490
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