When you ask "What number is halfway between 77 and 850?" 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=850.
To find the number halfway between 77 and 850, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 77 and 850 into our formula, we get:
(77 + 850)/2 = 463.5
Thus, the number halfway between 77 and 850 is 463.5.
To check that our answer is correct, we subtract 77 from 463.5 and subtract 463.5 from 850 and compare the two numbers:
463.5 - 77 = 386.5
850 - 463.5 = 386.5
As you can see, the halfway number is 386.5 higher than 77 and 386.5 lower than 850. Therefore, our halfway between answer of 463.5 above is correct.
Halfway Between
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