When you ask "What number is halfway between 72 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=72 and Y=123.
To find the number halfway between 72 and 123, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 72 and 123 into our formula, we get:
(72 + 123)/2 = 97.5
Thus, the number halfway between 72 and 123 is 97.5.
To check that our answer is correct, we subtract 72 from 97.5 and subtract 97.5 from 123 and compare the two numbers:
97.5 - 72 = 25.5
123 - 97.5 = 25.5
As you can see, the halfway number is 25.5 higher than 72 and 25.5 lower than 123. Therefore, our halfway between answer of 97.5 above is correct.
Halfway Between
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Halfway Between 72 and 124
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