When you ask "What number is halfway between 19 and 680?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=19 and Y=680.
To find the number halfway between 19 and 680, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 19 and 680 into our formula, we get:
(19 + 680)/2 = 349.5
Thus, the number halfway between 19 and 680 is 349.5.
To check that our answer is correct, we subtract 19 from 349.5 and subtract 349.5 from 680 and compare the two numbers:
349.5 - 19 = 330.5
680 - 349.5 = 330.5
As you can see, the halfway number is 330.5 higher than 19 and 330.5 lower than 680. Therefore, our halfway between answer of 349.5 above is correct.
Halfway Between
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