When you ask "What number is halfway between 77 and 310?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=77 and Y=310.
To find the number halfway between 77 and 310, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 77 and 310 into our formula, we get:
(77 + 310)/2 = 193.5
Thus, the number halfway between 77 and 310 is 193.5.
To check that our answer is correct, we subtract 77 from 193.5 and subtract 193.5 from 310 and compare the two numbers:
193.5 - 77 = 116.5
310 - 193.5 = 116.5
As you can see, the halfway number is 116.5 higher than 77 and 116.5 lower than 310. Therefore, our halfway between answer of 193.5 above is correct.
Halfway Between
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Halfway Between 77 and 311
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