When you ask "What number is halfway between 28 and 391?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=28 and Y=391.
To find the number halfway between 28 and 391, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 28 and 391 into our formula, we get:
(28 + 391)/2 = 209.5
Thus, the number halfway between 28 and 391 is 209.5.
To check that our answer is correct, we subtract 28 from 209.5 and subtract 209.5 from 391 and compare the two numbers:
209.5 - 28 = 181.5
391 - 209.5 = 181.5
As you can see, the halfway number is 181.5 higher than 28 and 181.5 lower than 391. Therefore, our halfway between answer of 209.5 above is correct.
Halfway Between
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Halfway Between 28 and 392
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