When you ask "What number is halfway between 99 and 290?" 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=290.
To find the number halfway between 99 and 290, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 99 and 290 into our formula, we get:
(99 + 290)/2 = 194.5
Thus, the number halfway between 99 and 290 is 194.5.
To check that our answer is correct, we subtract 99 from 194.5 and subtract 194.5 from 290 and compare the two numbers:
194.5 - 99 = 95.5
290 - 194.5 = 95.5
As you can see, the halfway number is 95.5 higher than 99 and 95.5 lower than 290. Therefore, our halfway between answer of 194.5 above is correct.
Halfway Between
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Halfway Between 99 and 291
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