When you ask "What number is halfway between 18 and 145?" 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=145.
To find the number halfway between 18 and 145, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 18 and 145 into our formula, we get:
(18 + 145)/2 = 81.5
Thus, the number halfway between 18 and 145 is 81.5.
To check that our answer is correct, we subtract 18 from 81.5 and subtract 81.5 from 145 and compare the two numbers:
81.5 - 18 = 63.5
145 - 81.5 = 63.5
As you can see, the halfway number is 63.5 higher than 18 and 63.5 lower than 145. Therefore, our halfway between answer of 81.5 above is correct.
Halfway Between
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Halfway Between 18 and 146
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