When you ask "What number is halfway between 3 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=3 and Y=28.
To find the number halfway between 3 and 28, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 3 and 28 into our formula, we get:
(3 + 28)/2 = 15.5
Thus, the number halfway between 3 and 28 is 15.5.
To check that our answer is correct, we subtract 3 from 15.5 and subtract 15.5 from 28 and compare the two numbers:
15.5 - 3 = 12.5
28 - 15.5 = 12.5
As you can see, the halfway number is 12.5 higher than 3 and 12.5 lower than 28. Therefore, our halfway between answer of 15.5 above is correct.
Halfway Between
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Halfway Between 3 and 29
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