When you ask "What number is halfway between 55 and 230?" 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=230.
To find the number halfway between 55 and 230, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 55 and 230 into our formula, we get:
(55 + 230)/2 = 142.5
Thus, the number halfway between 55 and 230 is 142.5.
To check that our answer is correct, we subtract 55 from 142.5 and subtract 142.5 from 230 and compare the two numbers:
142.5 - 55 = 87.5
230 - 142.5 = 87.5
As you can see, the halfway number is 87.5 higher than 55 and 87.5 lower than 230. Therefore, our halfway between answer of 142.5 above is correct.
Halfway Between
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Halfway Between 55 and 231
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