When you ask "What number is halfway between 64 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=64 and Y=489.
To find the number halfway between 64 and 489, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 64 and 489 into our formula, we get:
(64 + 489)/2 = 276.5
Thus, the number halfway between 64 and 489 is 276.5.
To check that our answer is correct, we subtract 64 from 276.5 and subtract 276.5 from 489 and compare the two numbers:
276.5 - 64 = 212.5
489 - 276.5 = 212.5
As you can see, the halfway number is 212.5 higher than 64 and 212.5 lower than 489. Therefore, our halfway between answer of 276.5 above is correct.
Halfway Between
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Halfway Between 64 and 490
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