When you ask "What number is halfway between 55 and 640?" 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=640.
To find the number halfway between 55 and 640, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 55 and 640 into our formula, we get:
(55 + 640)/2 = 347.5
Thus, the number halfway between 55 and 640 is 347.5.
To check that our answer is correct, we subtract 55 from 347.5 and subtract 347.5 from 640 and compare the two numbers:
347.5 - 55 = 292.5
640 - 347.5 = 292.5
As you can see, the halfway number is 292.5 higher than 55 and 292.5 lower than 640. Therefore, our halfway between answer of 347.5 above is correct.
Halfway Between
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