When you ask "What number is halfway between 77 and 324?" 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=324.
To find the number halfway between 77 and 324, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 77 and 324 into our formula, we get:
(77 + 324)/2 = 200.5
Thus, the number halfway between 77 and 324 is 200.5.
To check that our answer is correct, we subtract 77 from 200.5 and subtract 200.5 from 324 and compare the two numbers:
200.5 - 77 = 123.5
324 - 200.5 = 123.5
As you can see, the halfway number is 123.5 higher than 77 and 123.5 lower than 324. Therefore, our halfway between answer of 200.5 above is correct.
Halfway Between
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Halfway Between 77 and 325
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