When you ask "What number is halfway between 99 and 310?" 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=310.
To find the number halfway between 99 and 310, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 99 and 310 into our formula, we get:
(99 + 310)/2 = 204.5
Thus, the number halfway between 99 and 310 is 204.5.
To check that our answer is correct, we subtract 99 from 204.5 and subtract 204.5 from 310 and compare the two numbers:
204.5 - 99 = 105.5
310 - 204.5 = 105.5
As you can see, the halfway number is 105.5 higher than 99 and 105.5 lower than 310. Therefore, our halfway between answer of 204.5 above is correct.
Halfway Between
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Halfway Between 99 and 311
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