When you ask "What number is halfway between 69 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=69 and Y=640.
To find the number halfway between 69 and 640, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 69 and 640 into our formula, we get:
(69 + 640)/2 = 354.5
Thus, the number halfway between 69 and 640 is 354.5.
To check that our answer is correct, we subtract 69 from 354.5 and subtract 354.5 from 640 and compare the two numbers:
354.5 - 69 = 285.5
640 - 354.5 = 285.5
As you can see, the halfway number is 285.5 higher than 69 and 285.5 lower than 640. Therefore, our halfway between answer of 354.5 above is correct.
Halfway Between
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