When you ask "What number is halfway between 27 and 58?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=27 and Y=58.
To find the number halfway between 27 and 58, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 27 and 58 into our formula, we get:
(27 + 58)/2 = 42.5
Thus, the number halfway between 27 and 58 is 42.5.
To check that our answer is correct, we subtract 27 from 42.5 and subtract 42.5 from 58 and compare the two numbers:
42.5 - 27 = 15.5
58 - 42.5 = 15.5
As you can see, the halfway number is 15.5 higher than 27 and 15.5 lower than 58. Therefore, our halfway between answer of 42.5 above is correct.
Halfway Between
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Halfway Between 27 and 59
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