When you ask "What number is halfway between 99 and 288?" 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=288.
To find the number halfway between 99 and 288, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 99 and 288 into our formula, we get:
(99 + 288)/2 = 193.5
Thus, the number halfway between 99 and 288 is 193.5.
To check that our answer is correct, we subtract 99 from 193.5 and subtract 193.5 from 288 and compare the two numbers:
193.5 - 99 = 94.5
288 - 193.5 = 94.5
As you can see, the halfway number is 94.5 higher than 99 and 94.5 lower than 288. Therefore, our halfway between answer of 193.5 above is correct.
Halfway Between
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Halfway Between 99 and 289
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