When you ask "What number is halfway between 11 and 28?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=11 and Y=28.
To find the number halfway between 11 and 28, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 11 and 28 into our formula, we get:
(11 + 28)/2 = 19.5
Thus, the number halfway between 11 and 28 is 19.5.
To check that our answer is correct, we subtract 11 from 19.5 and subtract 19.5 from 28 and compare the two numbers:
19.5 - 11 = 8.5
28 - 19.5 = 8.5
As you can see, the halfway number is 8.5 higher than 11 and 8.5 lower than 28. Therefore, our halfway between answer of 19.5 above is correct.
Halfway Between
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Halfway Between 11 and 29
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