When you ask "What number is halfway between 4 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=4 and Y=489.
To find the number halfway between 4 and 489, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 4 and 489 into our formula, we get:
(4 + 489)/2 = 246.5
Thus, the number halfway between 4 and 489 is 246.5.
To check that our answer is correct, we subtract 4 from 246.5 and subtract 246.5 from 489 and compare the two numbers:
246.5 - 4 = 242.5
489 - 246.5 = 242.5
As you can see, the halfway number is 242.5 higher than 4 and 242.5 lower than 489. Therefore, our halfway between answer of 246.5 above is correct.
Halfway Between
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Halfway Between 4 and 490
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