When you ask "What number is halfway between 55 and 578?" 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=578.
To find the number halfway between 55 and 578, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 55 and 578 into our formula, we get:
(55 + 578)/2 = 316.5
Thus, the number halfway between 55 and 578 is 316.5.
To check that our answer is correct, we subtract 55 from 316.5 and subtract 316.5 from 578 and compare the two numbers:
316.5 - 55 = 261.5
578 - 316.5 = 261.5
As you can see, the halfway number is 261.5 higher than 55 and 261.5 lower than 578. Therefore, our halfway between answer of 316.5 above is correct.
Halfway Between
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Halfway Between 55 and 579
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