When you ask "What number is halfway between 15 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=15 and Y=123.
To find the number halfway between 15 and 123, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 15 and 123 into our formula, we get:
(15 + 123)/2 = 69
Thus, the number halfway between 15 and 123 is 69.
To check that our answer is correct, we subtract 15 from 69 and subtract 69 from 123 and compare the two numbers:
69 - 15 = 54
123 - 69 = 54
As you can see, the halfway number is 54 higher than 15 and 54 lower than 123. Therefore, our halfway between answer of 69 above is correct.
Halfway Between
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Halfway Between 15 and 124
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