When you ask "What number is halfway between 55 and 644?" 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=644.
To find the number halfway between 55 and 644, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 55 and 644 into our formula, we get:
(55 + 644)/2 = 349.5
Thus, the number halfway between 55 and 644 is 349.5.
To check that our answer is correct, we subtract 55 from 349.5 and subtract 349.5 from 644 and compare the two numbers:
349.5 - 55 = 294.5
644 - 349.5 = 294.5
As you can see, the halfway number is 294.5 higher than 55 and 294.5 lower than 644. Therefore, our halfway between answer of 349.5 above is correct.
Halfway Between
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Halfway Between 55 and 645
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