When you ask "What number is halfway between 18 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=18 and Y=123.
To find the number halfway between 18 and 123, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 18 and 123 into our formula, we get:
(18 + 123)/2 = 70.5
Thus, the number halfway between 18 and 123 is 70.5.
To check that our answer is correct, we subtract 18 from 70.5 and subtract 70.5 from 123 and compare the two numbers:
70.5 - 18 = 52.5
123 - 70.5 = 52.5
As you can see, the halfway number is 52.5 higher than 18 and 52.5 lower than 123. Therefore, our halfway between answer of 70.5 above is correct.
Halfway Between
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Halfway Between 18 and 124
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