When you ask "What number is halfway between 55 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=55 and Y=220.
To find the number halfway between 55 and 220, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 55 and 220 into our formula, we get:
(55 + 220)/2 = 137.5
Thus, the number halfway between 55 and 220 is 137.5.
To check that our answer is correct, we subtract 55 from 137.5 and subtract 137.5 from 220 and compare the two numbers:
137.5 - 55 = 82.5
220 - 137.5 = 82.5
As you can see, the halfway number is 82.5 higher than 55 and 82.5 lower than 220. Therefore, our halfway between answer of 137.5 above is correct.
Halfway Between
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Halfway Between 55 and 221
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