When you ask "What number is halfway between 99 and 386?" 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=386.
To find the number halfway between 99 and 386, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 99 and 386 into our formula, we get:
(99 + 386)/2 = 242.5
Thus, the number halfway between 99 and 386 is 242.5.
To check that our answer is correct, we subtract 99 from 242.5 and subtract 242.5 from 386 and compare the two numbers:
242.5 - 99 = 143.5
386 - 242.5 = 143.5
As you can see, the halfway number is 143.5 higher than 99 and 143.5 lower than 386. Therefore, our halfway between answer of 242.5 above is correct.
Halfway Between
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Halfway Between 99 and 387
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