When you ask "What number is halfway between 81 and 770?" 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=770.
To find the number halfway between 81 and 770, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 81 and 770 into our formula, we get:
(81 + 770)/2 = 425.5
Thus, the number halfway between 81 and 770 is 425.5.
To check that our answer is correct, we subtract 81 from 425.5 and subtract 425.5 from 770 and compare the two numbers:
425.5 - 81 = 344.5
770 - 425.5 = 344.5
As you can see, the halfway number is 344.5 higher than 81 and 344.5 lower than 770. Therefore, our halfway between answer of 425.5 above is correct.
Halfway Between
Find halfway between two other numbers here!
Halfway Between 81 and 771
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