When you ask "What number is halfway between 28 and 991?" 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=991.
To find the number halfway between 28 and 991, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 28 and 991 into our formula, we get:
(28 + 991)/2 = 509.5
Thus, the number halfway between 28 and 991 is 509.5.
To check that our answer is correct, we subtract 28 from 509.5 and subtract 509.5 from 991 and compare the two numbers:
509.5 - 28 = 481.5
991 - 509.5 = 481.5
As you can see, the halfway number is 481.5 higher than 28 and 481.5 lower than 991. Therefore, our halfway between answer of 509.5 above is correct.
Halfway Between
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Halfway Between 28 and 992
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