When you ask "What number is halfway between 55 and 378?" 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=378.
To find the number halfway between 55 and 378, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 55 and 378 into our formula, we get:
(55 + 378)/2 = 216.5
Thus, the number halfway between 55 and 378 is 216.5.
To check that our answer is correct, we subtract 55 from 216.5 and subtract 216.5 from 378 and compare the two numbers:
216.5 - 55 = 161.5
378 - 216.5 = 161.5
As you can see, the halfway number is 161.5 higher than 55 and 161.5 lower than 378. Therefore, our halfway between answer of 216.5 above is correct.
Halfway Between
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Halfway Between 55 and 379
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