When you ask "What number is halfway between 4 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=4 and Y=123.
To find the number halfway between 4 and 123, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 4 and 123 into our formula, we get:
(4 + 123)/2 = 63.5
Thus, the number halfway between 4 and 123 is 63.5.
To check that our answer is correct, we subtract 4 from 63.5 and subtract 63.5 from 123 and compare the two numbers:
63.5 - 4 = 59.5
123 - 63.5 = 59.5
As you can see, the halfway number is 59.5 higher than 4 and 59.5 lower than 123. Therefore, our halfway between answer of 63.5 above is correct.
Halfway Between
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Halfway Between 4 and 124
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