When you ask "What number is halfway between 99 and 488?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=99 and Y=488.
To find the number halfway between 99 and 488, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 99 and 488 into our formula, we get:
(99 + 488)/2 = 293.5
Thus, the number halfway between 99 and 488 is 293.5.
To check that our answer is correct, we subtract 99 from 293.5 and subtract 293.5 from 488 and compare the two numbers:
293.5 - 99 = 194.5
488 - 293.5 = 194.5
As you can see, the halfway number is 194.5 higher than 99 and 194.5 lower than 488. Therefore, our halfway between answer of 293.5 above is correct.
Halfway Between
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Halfway Between 99 and 489
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