When you ask "What number is halfway between 18 and 135?" 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=135.
To find the number halfway between 18 and 135, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 18 and 135 into our formula, we get:
(18 + 135)/2 = 76.5
Thus, the number halfway between 18 and 135 is 76.5.
To check that our answer is correct, we subtract 18 from 76.5 and subtract 76.5 from 135 and compare the two numbers:
76.5 - 18 = 58.5
135 - 76.5 = 58.5
As you can see, the halfway number is 58.5 higher than 18 and 58.5 lower than 135. Therefore, our halfway between answer of 76.5 above is correct.
Halfway Between
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Halfway Between 18 and 136
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