When you ask "What number is halfway between 84 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=84 and Y=123.
To find the number halfway between 84 and 123, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 84 and 123 into our formula, we get:
(84 + 123)/2 = 103.5
Thus, the number halfway between 84 and 123 is 103.5.
To check that our answer is correct, we subtract 84 from 103.5 and subtract 103.5 from 123 and compare the two numbers:
103.5 - 84 = 19.5
123 - 103.5 = 19.5
As you can see, the halfway number is 19.5 higher than 84 and 19.5 lower than 123. Therefore, our halfway between answer of 103.5 above is correct.
Halfway Between
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Halfway Between 84 and 124
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