When you ask "What number is halfway between 63 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=63 and Y=640.
To find the number halfway between 63 and 640, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 63 and 640 into our formula, we get:
(63 + 640)/2 = 351.5
Thus, the number halfway between 63 and 640 is 351.5.
To check that our answer is correct, we subtract 63 from 351.5 and subtract 351.5 from 640 and compare the two numbers:
351.5 - 63 = 288.5
640 - 351.5 = 288.5
As you can see, the halfway number is 288.5 higher than 63 and 288.5 lower than 640. Therefore, our halfway between answer of 351.5 above is correct.
Halfway Between
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