When you ask "What number is halfway between 99 and 258?" 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=258.
To find the number halfway between 99 and 258, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 99 and 258 into our formula, we get:
(99 + 258)/2 = 178.5
Thus, the number halfway between 99 and 258 is 178.5.
To check that our answer is correct, we subtract 99 from 178.5 and subtract 178.5 from 258 and compare the two numbers:
178.5 - 99 = 79.5
258 - 178.5 = 79.5
As you can see, the halfway number is 79.5 higher than 99 and 79.5 lower than 258. Therefore, our halfway between answer of 178.5 above is correct.
Halfway Between
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Halfway Between 99 and 259
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