When you ask "What number is halfway between 47 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=47 and Y=640.
To find the number halfway between 47 and 640, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 47 and 640 into our formula, we get:
(47 + 640)/2 = 343.5
Thus, the number halfway between 47 and 640 is 343.5.
To check that our answer is correct, we subtract 47 from 343.5 and subtract 343.5 from 640 and compare the two numbers:
343.5 - 47 = 296.5
640 - 343.5 = 296.5
As you can see, the halfway number is 296.5 higher than 47 and 296.5 lower than 640. Therefore, our halfway between answer of 343.5 above is correct.
Halfway Between
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