When you ask "What number is halfway between 77 and 872?" 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=872.
To find the number halfway between 77 and 872, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 77 and 872 into our formula, we get:
(77 + 872)/2 = 474.5
Thus, the number halfway between 77 and 872 is 474.5.
To check that our answer is correct, we subtract 77 from 474.5 and subtract 474.5 from 872 and compare the two numbers:
474.5 - 77 = 397.5
872 - 474.5 = 397.5
As you can see, the halfway number is 397.5 higher than 77 and 397.5 lower than 872. Therefore, our halfway between answer of 474.5 above is correct.
Halfway Between
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Halfway Between 77 and 873
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