When you ask "What number is halfway between 99 and 315?" 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=315.
To find the number halfway between 99 and 315, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 99 and 315 into our formula, we get:
(99 + 315)/2 = 207
Thus, the number halfway between 99 and 315 is 207.
To check that our answer is correct, we subtract 99 from 207 and subtract 207 from 315 and compare the two numbers:
207 - 99 = 108
315 - 207 = 108
As you can see, the halfway number is 108 higher than 99 and 108 lower than 315. Therefore, our halfway between answer of 207 above is correct.
Halfway Between
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Halfway Between 99 and 316
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