When you ask "What number is halfway between 23 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=23 and Y=123.
To find the number halfway between 23 and 123, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 23 and 123 into our formula, we get:
(23 + 123)/2 = 73
Thus, the number halfway between 23 and 123 is 73.
To check that our answer is correct, we subtract 23 from 73 and subtract 73 from 123 and compare the two numbers:
73 - 23 = 50
123 - 73 = 50
As you can see, the halfway number is 50 higher than 23 and 50 lower than 123. Therefore, our halfway between answer of 73 above is correct.
Halfway Between
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Halfway Between 23 and 124
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