When you ask "What number is halfway between 49 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=49 and Y=640.
To find the number halfway between 49 and 640, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 49 and 640 into our formula, we get:
(49 + 640)/2 = 344.5
Thus, the number halfway between 49 and 640 is 344.5.
To check that our answer is correct, we subtract 49 from 344.5 and subtract 344.5 from 640 and compare the two numbers:
344.5 - 49 = 295.5
640 - 344.5 = 295.5
As you can see, the halfway number is 295.5 higher than 49 and 295.5 lower than 640. Therefore, our halfway between answer of 344.5 above is correct.
Halfway Between
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