When you ask "What number is halfway between 29 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=29 and Y=640.
To find the number halfway between 29 and 640, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 29 and 640 into our formula, we get:
(29 + 640)/2 = 334.5
Thus, the number halfway between 29 and 640 is 334.5.
To check that our answer is correct, we subtract 29 from 334.5 and subtract 334.5 from 640 and compare the two numbers:
334.5 - 29 = 305.5
640 - 334.5 = 305.5
As you can see, the halfway number is 305.5 higher than 29 and 305.5 lower than 640. Therefore, our halfway between answer of 334.5 above is correct.
Halfway Between
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