When you ask "What number is halfway between 87 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=87 and Y=489.
To find the number halfway between 87 and 489, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 87 and 489 into our formula, we get:
(87 + 489)/2 = 288
Thus, the number halfway between 87 and 489 is 288.
To check that our answer is correct, we subtract 87 from 288 and subtract 288 from 489 and compare the two numbers:
288 - 87 = 201
489 - 288 = 201
As you can see, the halfway number is 201 higher than 87 and 201 lower than 489. Therefore, our halfway between answer of 288 above is correct.
Halfway Between
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Halfway Between 87 and 490
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