When you ask "What number is halfway between 80 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=80 and Y=123.
To find the number halfway between 80 and 123, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 80 and 123 into our formula, we get:
(80 + 123)/2 = 101.5
Thus, the number halfway between 80 and 123 is 101.5.
To check that our answer is correct, we subtract 80 from 101.5 and subtract 101.5 from 123 and compare the two numbers:
101.5 - 80 = 21.5
123 - 101.5 = 21.5
As you can see, the halfway number is 21.5 higher than 80 and 21.5 lower than 123. Therefore, our halfway between answer of 101.5 above is correct.
Halfway Between
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Halfway Between 80 and 124
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