When you ask "What number is halfway between 27 and 220?" 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=220.
To find the number halfway between 27 and 220, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 27 and 220 into our formula, we get:
(27 + 220)/2 = 123.5
Thus, the number halfway between 27 and 220 is 123.5.
To check that our answer is correct, we subtract 27 from 123.5 and subtract 123.5 from 220 and compare the two numbers:
123.5 - 27 = 96.5
220 - 123.5 = 96.5
As you can see, the halfway number is 96.5 higher than 27 and 96.5 lower than 220. Therefore, our halfway between answer of 123.5 above is correct.
Halfway Between
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Halfway Between 27 and 221
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