When you ask "What number is halfway between 99 and 417?" 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=417.
To find the number halfway between 99 and 417, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 99 and 417 into our formula, we get:
(99 + 417)/2 = 258
Thus, the number halfway between 99 and 417 is 258.
To check that our answer is correct, we subtract 99 from 258 and subtract 258 from 417 and compare the two numbers:
258 - 99 = 159
417 - 258 = 159
As you can see, the halfway number is 159 higher than 99 and 159 lower than 417. Therefore, our halfway between answer of 258 above is correct.
Halfway Between
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Halfway Between 99 and 418
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