When you ask "What number is halfway between 77 and 542?" 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=542.
To find the number halfway between 77 and 542, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 77 and 542 into our formula, we get:
(77 + 542)/2 = 309.5
Thus, the number halfway between 77 and 542 is 309.5.
To check that our answer is correct, we subtract 77 from 309.5 and subtract 309.5 from 542 and compare the two numbers:
309.5 - 77 = 232.5
542 - 309.5 = 232.5
As you can see, the halfway number is 232.5 higher than 77 and 232.5 lower than 542. Therefore, our halfway between answer of 309.5 above is correct.
Halfway Between
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Halfway Between 77 and 543
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