When you ask "What number is halfway between 55 and 312?" 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=312.
To find the number halfway between 55 and 312, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 55 and 312 into our formula, we get:
(55 + 312)/2 = 183.5
Thus, the number halfway between 55 and 312 is 183.5.
To check that our answer is correct, we subtract 55 from 183.5 and subtract 183.5 from 312 and compare the two numbers:
183.5 - 55 = 128.5
312 - 183.5 = 128.5
As you can see, the halfway number is 128.5 higher than 55 and 128.5 lower than 312. Therefore, our halfway between answer of 183.5 above is correct.
Halfway Between
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