When you ask "What number is halfway between 77 and 290?" 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=290.
To find the number halfway between 77 and 290, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 77 and 290 into our formula, we get:
(77 + 290)/2 = 183.5
Thus, the number halfway between 77 and 290 is 183.5.
To check that our answer is correct, we subtract 77 from 183.5 and subtract 183.5 from 290 and compare the two numbers:
183.5 - 77 = 106.5
290 - 183.5 = 106.5
As you can see, the halfway number is 106.5 higher than 77 and 106.5 lower than 290. Therefore, our halfway between answer of 183.5 above is correct.
Halfway Between
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Halfway Between 77 and 291
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