When you ask "What number is halfway between 18 and 678?" 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=678.
To find the number halfway between 18 and 678, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 18 and 678 into our formula, we get:
(18 + 678)/2 = 348
Thus, the number halfway between 18 and 678 is 348.
To check that our answer is correct, we subtract 18 from 348 and subtract 348 from 678 and compare the two numbers:
348 - 18 = 330
678 - 348 = 330
As you can see, the halfway number is 330 higher than 18 and 330 lower than 678. Therefore, our halfway between answer of 348 above is correct.
Halfway Between
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Halfway Between 18 and 679
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