When you ask "What number is halfway between 18 and 42?" 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=42.
To find the number halfway between 18 and 42, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 18 and 42 into our formula, we get:
(18 + 42)/2 = 30
Thus, the number halfway between 18 and 42 is 30.
To check that our answer is correct, we subtract 18 from 30 and subtract 30 from 42 and compare the two numbers:
30 - 18 = 12
42 - 30 = 12
As you can see, the halfway number is 12 higher than 18 and 12 lower than 42. Therefore, our halfway between answer of 30 above is correct.
Halfway Between
Find halfway between two other numbers here!
Halfway Between 18 and 43
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