When you ask "What number is halfway between 17 and 778?" 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=778.
To find the number halfway between 17 and 778, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 17 and 778 into our formula, we get:
(17 + 778)/2 = 397.5
Thus, the number halfway between 17 and 778 is 397.5.
To check that our answer is correct, we subtract 17 from 397.5 and subtract 397.5 from 778 and compare the two numbers:
397.5 - 17 = 380.5
778 - 397.5 = 380.5
As you can see, the halfway number is 380.5 higher than 17 and 380.5 lower than 778. Therefore, our halfway between answer of 397.5 above is correct.
Halfway Between
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Halfway Between 17 and 779
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