When you ask "What number is halfway between 18 and 318?" 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=318.
To find the number halfway between 18 and 318, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 18 and 318 into our formula, we get:
(18 + 318)/2 = 168
Thus, the number halfway between 18 and 318 is 168.
To check that our answer is correct, we subtract 18 from 168 and subtract 168 from 318 and compare the two numbers:
168 - 18 = 150
318 - 168 = 150
As you can see, the halfway number is 150 higher than 18 and 150 lower than 318. Therefore, our halfway between answer of 168 above is correct.
Halfway Between
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Halfway Between 18 and 319
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