When you ask "What number is halfway between 13 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=13 and Y=123.
To find the number halfway between 13 and 123, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 13 and 123 into our formula, we get:
(13 + 123)/2 = 68
Thus, the number halfway between 13 and 123 is 68.
To check that our answer is correct, we subtract 13 from 68 and subtract 68 from 123 and compare the two numbers:
68 - 13 = 55
123 - 68 = 55
As you can see, the halfway number is 55 higher than 13 and 55 lower than 123. Therefore, our halfway between answer of 68 above is correct.
Halfway Between
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Halfway Between 13 and 124
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