When you ask "What number is halfway between 77 and 550?" 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=550.
To find the number halfway between 77 and 550, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 77 and 550 into our formula, we get:
(77 + 550)/2 = 313.5
Thus, the number halfway between 77 and 550 is 313.5.
To check that our answer is correct, we subtract 77 from 313.5 and subtract 313.5 from 550 and compare the two numbers:
313.5 - 77 = 236.5
550 - 313.5 = 236.5
As you can see, the halfway number is 236.5 higher than 77 and 236.5 lower than 550. Therefore, our halfway between answer of 313.5 above is correct.
Halfway Between
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Halfway Between 77 and 551
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