When you ask "What number is halfway between 18 and 113?" 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=113.
To find the number halfway between 18 and 113, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 18 and 113 into our formula, we get:
(18 + 113)/2 = 65.5
Thus, the number halfway between 18 and 113 is 65.5.
To check that our answer is correct, we subtract 18 from 65.5 and subtract 65.5 from 113 and compare the two numbers:
65.5 - 18 = 47.5
113 - 65.5 = 47.5
As you can see, the halfway number is 47.5 higher than 18 and 47.5 lower than 113. Therefore, our halfway between answer of 65.5 above is correct.
Halfway Between
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Halfway Between 18 and 114
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