When you ask "What number is halfway between 31 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=31 and Y=778.
To find the number halfway between 31 and 778, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 31 and 778 into our formula, we get:
(31 + 778)/2 = 404.5
Thus, the number halfway between 31 and 778 is 404.5.
To check that our answer is correct, we subtract 31 from 404.5 and subtract 404.5 from 778 and compare the two numbers:
404.5 - 31 = 373.5
778 - 404.5 = 373.5
As you can see, the halfway number is 373.5 higher than 31 and 373.5 lower than 778. Therefore, our halfway between answer of 404.5 above is correct.
Halfway Between
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Halfway Between 31 and 779
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