When you ask "What number is halfway between 99 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=99 and Y=780.
To find the number halfway between 99 and 780, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 99 and 780 into our formula, we get:
(99 + 780)/2 = 439.5
Thus, the number halfway between 99 and 780 is 439.5.
To check that our answer is correct, we subtract 99 from 439.5 and subtract 439.5 from 780 and compare the two numbers:
439.5 - 99 = 340.5
780 - 439.5 = 340.5
As you can see, the halfway number is 340.5 higher than 99 and 340.5 lower than 780. Therefore, our halfway between answer of 439.5 above is correct.
Halfway Between
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