When you ask "What number is halfway between 55 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=55 and Y=318.
To find the number halfway between 55 and 318, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 55 and 318 into our formula, we get:
(55 + 318)/2 = 186.5
Thus, the number halfway between 55 and 318 is 186.5.
To check that our answer is correct, we subtract 55 from 186.5 and subtract 186.5 from 318 and compare the two numbers:
186.5 - 55 = 131.5
318 - 186.5 = 131.5
As you can see, the halfway number is 131.5 higher than 55 and 131.5 lower than 318. Therefore, our halfway between answer of 186.5 above is correct.
Halfway Between
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Halfway Between 55 and 319
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