
When you ask "What number is halfway between 56 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=56 and Y=123.

To find the number halfway between 56 and 123, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 56 and 123 into our formula, we get:
(56 + 123)/2 = 89.5
Thus, the number halfway between 56 and 123 is 89.5.
To check that our answer is correct, we subtract 56 from 89.5 and subtract 89.5 from 123 and compare the two numbers:
89.5 - 56 = 33.5
123 - 89.5 = 33.5
As you can see, the halfway number is 33.5 higher than 56 and 33.5 lower than 123. Therefore, our halfway between answer of 89.5 above is correct.
Halfway Between
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Halfway Between 56 and 124
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