When you ask "What number is halfway between 99 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=99 and Y=778.
To find the number halfway between 99 and 778, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 99 and 778 into our formula, we get:
(99 + 778)/2 = 438.5
Thus, the number halfway between 99 and 778 is 438.5.
To check that our answer is correct, we subtract 99 from 438.5 and subtract 438.5 from 778 and compare the two numbers:
438.5 - 99 = 339.5
778 - 438.5 = 339.5
As you can see, the halfway number is 339.5 higher than 99 and 339.5 lower than 778. Therefore, our halfway between answer of 438.5 above is correct.
Halfway Between
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Halfway Between 99 and 779
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