When you ask "What number is halfway between 55 and 216?" 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=216.
To find the number halfway between 55 and 216, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 55 and 216 into our formula, we get:
(55 + 216)/2 = 135.5
Thus, the number halfway between 55 and 216 is 135.5.
To check that our answer is correct, we subtract 55 from 135.5 and subtract 135.5 from 216 and compare the two numbers:
135.5 - 55 = 80.5
216 - 135.5 = 80.5
As you can see, the halfway number is 80.5 higher than 55 and 80.5 lower than 216. Therefore, our halfway between answer of 135.5 above is correct.
Halfway Between
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Halfway Between 55 and 217
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