When you ask "What number is halfway between 99 and 254?" 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=254.
To find the number halfway between 99 and 254, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 99 and 254 into our formula, we get:
(99 + 254)/2 = 176.5
Thus, the number halfway between 99 and 254 is 176.5.
To check that our answer is correct, we subtract 99 from 176.5 and subtract 176.5 from 254 and compare the two numbers:
176.5 - 99 = 77.5
254 - 176.5 = 77.5
As you can see, the halfway number is 77.5 higher than 99 and 77.5 lower than 254. Therefore, our halfway between answer of 176.5 above is correct.
Halfway Between
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Halfway Between 99 and 255
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