When you ask "What number is halfway between 11 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=11 and Y=318.
To find the number halfway between 11 and 318, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 11 and 318 into our formula, we get:
(11 + 318)/2 = 164.5
Thus, the number halfway between 11 and 318 is 164.5.
To check that our answer is correct, we subtract 11 from 164.5 and subtract 164.5 from 318 and compare the two numbers:
164.5 - 11 = 153.5
318 - 164.5 = 153.5
As you can see, the halfway number is 153.5 higher than 11 and 153.5 lower than 318. Therefore, our halfway between answer of 164.5 above is correct.
Halfway Between
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Halfway Between 11 and 319
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