When you ask "What number is halfway between 100 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=100 and Y=489.
To find the number halfway between 100 and 489, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 100 and 489 into our formula, we get:
(100 + 489)/2 = 294.5
Thus, the number halfway between 100 and 489 is 294.5.
To check that our answer is correct, we subtract 100 from 294.5 and subtract 294.5 from 489 and compare the two numbers:
294.5 - 100 = 194.5
489 - 294.5 = 194.5
As you can see, the halfway number is 194.5 higher than 100 and 194.5 lower than 489. Therefore, our halfway between answer of 294.5 above is correct.
Halfway Between
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