When you ask "What number is halfway between 75 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=75 and Y=123.
To find the number halfway between 75 and 123, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 75 and 123 into our formula, we get:
(75 + 123)/2 = 99
Thus, the number halfway between 75 and 123 is 99.
To check that our answer is correct, we subtract 75 from 99 and subtract 99 from 123 and compare the two numbers:
99 - 75 = 24
123 - 99 = 24
As you can see, the halfway number is 24 higher than 75 and 24 lower than 123. Therefore, our halfway between answer of 99 above is correct.
Halfway Between
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Halfway Between 75 and 124
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