When you ask "What number is halfway between 18 and 673?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=18 and Y=673.
To find the number halfway between 18 and 673, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 18 and 673 into our formula, we get:
(18 + 673)/2 = 345.5
Thus, the number halfway between 18 and 673 is 345.5.
To check that our answer is correct, we subtract 18 from 345.5 and subtract 345.5 from 673 and compare the two numbers:
345.5 - 18 = 327.5
673 - 345.5 = 327.5
As you can see, the halfway number is 327.5 higher than 18 and 327.5 lower than 673. Therefore, our halfway between answer of 345.5 above is correct.
Halfway Between
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Halfway Between 18 and 674
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