When you ask "What number is halfway between 27 and 123?" 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=123.
To find the number halfway between 27 and 123, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 27 and 123 into our formula, we get:
(27 + 123)/2 = 75
Thus, the number halfway between 27 and 123 is 75.
To check that our answer is correct, we subtract 27 from 75 and subtract 75 from 123 and compare the two numbers:
75 - 27 = 48
123 - 75 = 48
As you can see, the halfway number is 48 higher than 27 and 48 lower than 123. Therefore, our halfway between answer of 75 above is correct.
Halfway Between
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Halfway Between 27 and 124
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