When you ask "What number is halfway between 18 and 19?" 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=19.
To find the number halfway between 18 and 19, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 18 and 19 into our formula, we get:
(18 + 19)/2 = 18.5
Thus, the number halfway between 18 and 19 is 18.5.
To check that our answer is correct, we subtract 18 from 18.5 and subtract 18.5 from 19 and compare the two numbers:
18.5 - 18 = 0.5
19 - 18.5 = 0.5
As you can see, the halfway number is 0.5 higher than 18 and 0.5 lower than 19. Therefore, our halfway between answer of 18.5 above is correct.
Halfway Between
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