When you ask "What number is halfway between 77 and 322?" 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=322.
To find the number halfway between 77 and 322, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 77 and 322 into our formula, we get:
(77 + 322)/2 = 199.5
Thus, the number halfway between 77 and 322 is 199.5.
To check that our answer is correct, we subtract 77 from 199.5 and subtract 199.5 from 322 and compare the two numbers:
199.5 - 77 = 122.5
322 - 199.5 = 122.5
As you can see, the halfway number is 122.5 higher than 77 and 122.5 lower than 322. Therefore, our halfway between answer of 199.5 above is correct.
Halfway Between
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Halfway Between 77 and 323
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