When you ask "What number is halfway between 11 and 306?" 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=306.
To find the number halfway between 11 and 306, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 11 and 306 into our formula, we get:
(11 + 306)/2 = 158.5
Thus, the number halfway between 11 and 306 is 158.5.
To check that our answer is correct, we subtract 11 from 158.5 and subtract 158.5 from 306 and compare the two numbers:
158.5 - 11 = 147.5
306 - 158.5 = 147.5
As you can see, the halfway number is 147.5 higher than 11 and 147.5 lower than 306. Therefore, our halfway between answer of 158.5 above is correct.
Halfway Between
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Halfway Between 11 and 307
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