When you ask "What number is halfway between 27 and 218?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=27 and Y=218.
To find the number halfway between 27 and 218, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 27 and 218 into our formula, we get:
(27 + 218)/2 = 122.5
Thus, the number halfway between 27 and 218 is 122.5.
To check that our answer is correct, we subtract 27 from 122.5 and subtract 122.5 from 218 and compare the two numbers:
122.5 - 27 = 95.5
218 - 122.5 = 95.5
As you can see, the halfway number is 95.5 higher than 27 and 95.5 lower than 218. Therefore, our halfway between answer of 122.5 above is correct.
Halfway Between
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Halfway Between 27 and 219
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