When you ask "What number is halfway between 55 and 212?" 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=212.
To find the number halfway between 55 and 212, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 55 and 212 into our formula, we get:
(55 + 212)/2 = 133.5
Thus, the number halfway between 55 and 212 is 133.5.
To check that our answer is correct, we subtract 55 from 133.5 and subtract 133.5 from 212 and compare the two numbers:
133.5 - 55 = 78.5
212 - 133.5 = 78.5
As you can see, the halfway number is 78.5 higher than 55 and 78.5 lower than 212. Therefore, our halfway between answer of 133.5 above is correct.
Halfway Between
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Halfway Between 55 and 213
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