When you ask "What number is halfway between 22 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=22 and Y=778.
To find the number halfway between 22 and 778, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 22 and 778 into our formula, we get:
(22 + 778)/2 = 400
Thus, the number halfway between 22 and 778 is 400.
To check that our answer is correct, we subtract 22 from 400 and subtract 400 from 778 and compare the two numbers:
400 - 22 = 378
778 - 400 = 378
As you can see, the halfway number is 378 higher than 22 and 378 lower than 778. Therefore, our halfway between answer of 400 above is correct.
Halfway Between
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Halfway Between 22 and 779
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