When you ask "What number is halfway between 99 and 415?" 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=415.
To find the number halfway between 99 and 415, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 99 and 415 into our formula, we get:
(99 + 415)/2 = 257
Thus, the number halfway between 99 and 415 is 257.
To check that our answer is correct, we subtract 99 from 257 and subtract 257 from 415 and compare the two numbers:
257 - 99 = 158
415 - 257 = 158
As you can see, the halfway number is 158 higher than 99 and 158 lower than 415. Therefore, our halfway between answer of 257 above is correct.
Halfway Between
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Halfway Between 99 and 416
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