When you ask "What number is halfway between 18 and 689?" 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=689.
To find the number halfway between 18 and 689, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 18 and 689 into our formula, we get:
(18 + 689)/2 = 353.5
Thus, the number halfway between 18 and 689 is 353.5.
To check that our answer is correct, we subtract 18 from 353.5 and subtract 353.5 from 689 and compare the two numbers:
353.5 - 18 = 335.5
689 - 353.5 = 335.5
As you can see, the halfway number is 335.5 higher than 18 and 335.5 lower than 689. Therefore, our halfway between answer of 353.5 above is correct.
Halfway Between
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Halfway Between 18 and 690
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