When you ask "What number is halfway between 77 and 408?" 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=408.
To find the number halfway between 77 and 408, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 77 and 408 into our formula, we get:
(77 + 408)/2 = 242.5
Thus, the number halfway between 77 and 408 is 242.5.
To check that our answer is correct, we subtract 77 from 242.5 and subtract 242.5 from 408 and compare the two numbers:
242.5 - 77 = 165.5
408 - 242.5 = 165.5
As you can see, the halfway number is 165.5 higher than 77 and 165.5 lower than 408. Therefore, our halfway between answer of 242.5 above is correct.
Halfway Between
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Halfway Between 77 and 409
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