When you ask "What number is halfway between 18 and 665?" 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=665.
To find the number halfway between 18 and 665, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 18 and 665 into our formula, we get:
(18 + 665)/2 = 341.5
Thus, the number halfway between 18 and 665 is 341.5.
To check that our answer is correct, we subtract 18 from 341.5 and subtract 341.5 from 665 and compare the two numbers:
341.5 - 18 = 323.5
665 - 341.5 = 323.5
As you can see, the halfway number is 323.5 higher than 18 and 323.5 lower than 665. Therefore, our halfway between answer of 341.5 above is correct.
Halfway Between
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Halfway Between 18 and 666
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