When you ask "What number is halfway between 18 and 309?" 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=309.
To find the number halfway between 18 and 309, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 18 and 309 into our formula, we get:
(18 + 309)/2 = 163.5
Thus, the number halfway between 18 and 309 is 163.5.
To check that our answer is correct, we subtract 18 from 163.5 and subtract 163.5 from 309 and compare the two numbers:
163.5 - 18 = 145.5
309 - 163.5 = 145.5
As you can see, the halfway number is 145.5 higher than 18 and 145.5 lower than 309. Therefore, our halfway between answer of 163.5 above is correct.
Halfway Between
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Halfway Between 18 and 310
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