When you ask "What number is halfway between 17 and 780?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=17 and Y=780.
To find the number halfway between 17 and 780, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 17 and 780 into our formula, we get:
(17 + 780)/2 = 398.5
Thus, the number halfway between 17 and 780 is 398.5.
To check that our answer is correct, we subtract 17 from 398.5 and subtract 398.5 from 780 and compare the two numbers:
398.5 - 17 = 381.5
780 - 398.5 = 381.5
As you can see, the halfway number is 381.5 higher than 17 and 381.5 lower than 780. Therefore, our halfway between answer of 398.5 above is correct.
Halfway Between
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