When you ask "What number is halfway between 81 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=81 and Y=780.
To find the number halfway between 81 and 780, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 81 and 780 into our formula, we get:
(81 + 780)/2 = 430.5
Thus, the number halfway between 81 and 780 is 430.5.
To check that our answer is correct, we subtract 81 from 430.5 and subtract 430.5 from 780 and compare the two numbers:
430.5 - 81 = 349.5
780 - 430.5 = 349.5
As you can see, the halfway number is 349.5 higher than 81 and 349.5 lower than 780. Therefore, our halfway between answer of 430.5 above is correct.
Halfway Between
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