When you ask "What number is halfway between 75 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=75 and Y=640.
To find the number halfway between 75 and 640, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 75 and 640 into our formula, we get:
(75 + 640)/2 = 357.5
Thus, the number halfway between 75 and 640 is 357.5.
To check that our answer is correct, we subtract 75 from 357.5 and subtract 357.5 from 640 and compare the two numbers:
357.5 - 75 = 282.5
640 - 357.5 = 282.5
As you can see, the halfway number is 282.5 higher than 75 and 282.5 lower than 640. Therefore, our halfway between answer of 357.5 above is correct.
Halfway Between
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