When you ask "What number is halfway between 27 and 122?" 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=122.
To find the number halfway between 27 and 122, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 27 and 122 into our formula, we get:
(27 + 122)/2 = 74.5
Thus, the number halfway between 27 and 122 is 74.5.
To check that our answer is correct, we subtract 27 from 74.5 and subtract 74.5 from 122 and compare the two numbers:
74.5 - 27 = 47.5
122 - 74.5 = 47.5
As you can see, the halfway number is 47.5 higher than 27 and 47.5 lower than 122. Therefore, our halfway between answer of 74.5 above is correct.
Halfway Between
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Halfway Between 27 and 123
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