When you ask "What number is halfway between 99 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=99 and Y=770.
To find the number halfway between 99 and 770, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 99 and 770 into our formula, we get:
(99 + 770)/2 = 434.5
Thus, the number halfway between 99 and 770 is 434.5.
To check that our answer is correct, we subtract 99 from 434.5 and subtract 434.5 from 770 and compare the two numbers:
434.5 - 99 = 335.5
770 - 434.5 = 335.5
As you can see, the halfway number is 335.5 higher than 99 and 335.5 lower than 770. Therefore, our halfway between answer of 434.5 above is correct.
Halfway Between
Find halfway between two other numbers here!
Halfway Between 99 and 771
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