When you ask "What number is halfway between 30 and 777?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=30 and Y=777.
To find the number halfway between 30 and 777, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 30 and 777 into our formula, we get:
(30 + 777)/2 = 403.5
Thus, the number halfway between 30 and 777 is 403.5.
To check that our answer is correct, we subtract 30 from 403.5 and subtract 403.5 from 777 and compare the two numbers:
403.5 - 30 = 373.5
777 - 403.5 = 373.5
As you can see, the halfway number is 373.5 higher than 30 and 373.5 lower than 777. Therefore, our halfway between answer of 403.5 above is correct.
Halfway Between
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Halfway Between 30 and 778
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