When you ask "What number is halfway between 77 and 204?" 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=204.
To find the number halfway between 77 and 204, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 77 and 204 into our formula, we get:
(77 + 204)/2 = 140.5
Thus, the number halfway between 77 and 204 is 140.5.
To check that our answer is correct, we subtract 77 from 140.5 and subtract 140.5 from 204 and compare the two numbers:
140.5 - 77 = 63.5
204 - 140.5 = 63.5
As you can see, the halfway number is 63.5 higher than 77 and 63.5 lower than 204. Therefore, our halfway between answer of 140.5 above is correct.
Halfway Between
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Halfway Between 77 and 205
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