When you ask "What number is halfway between 18 and 310?" 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=310.
To find the number halfway between 18 and 310, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 18 and 310 into our formula, we get:
(18 + 310)/2 = 164
Thus, the number halfway between 18 and 310 is 164.
To check that our answer is correct, we subtract 18 from 164 and subtract 164 from 310 and compare the two numbers:
164 - 18 = 146
310 - 164 = 146
As you can see, the halfway number is 146 higher than 18 and 146 lower than 310. Therefore, our halfway between answer of 164 above is correct.
Halfway Between
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Halfway Between 18 and 311
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