When you ask "What number is halfway between 73 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=73 and Y=640.
To find the number halfway between 73 and 640, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 73 and 640 into our formula, we get:
(73 + 640)/2 = 356.5
Thus, the number halfway between 73 and 640 is 356.5.
To check that our answer is correct, we subtract 73 from 356.5 and subtract 356.5 from 640 and compare the two numbers:
356.5 - 73 = 283.5
640 - 356.5 = 283.5
As you can see, the halfway number is 283.5 higher than 73 and 283.5 lower than 640. Therefore, our halfway between answer of 356.5 above is correct.
Halfway Between
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