When you ask "What number is halfway between 77 and 354?" 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=354.
To find the number halfway between 77 and 354, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 77 and 354 into our formula, we get:
(77 + 354)/2 = 215.5
Thus, the number halfway between 77 and 354 is 215.5.
To check that our answer is correct, we subtract 77 from 215.5 and subtract 215.5 from 354 and compare the two numbers:
215.5 - 77 = 138.5
354 - 215.5 = 138.5
As you can see, the halfway number is 138.5 higher than 77 and 138.5 lower than 354. Therefore, our halfway between answer of 215.5 above is correct.
Halfway Between
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Halfway Between 77 and 355
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