When you ask "What number is halfway between 77 and 258?" 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=258.
To find the number halfway between 77 and 258, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 77 and 258 into our formula, we get:
(77 + 258)/2 = 167.5
Thus, the number halfway between 77 and 258 is 167.5.
To check that our answer is correct, we subtract 77 from 167.5 and subtract 167.5 from 258 and compare the two numbers:
167.5 - 77 = 90.5
258 - 167.5 = 90.5
As you can see, the halfway number is 90.5 higher than 77 and 90.5 lower than 258. Therefore, our halfway between answer of 167.5 above is correct.
Halfway Between
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Halfway Between 77 and 259
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