
When you ask "What number is halfway between 51 and 180?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=51 and Y=180.

To find the number halfway between 51 and 180, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 51 and 180 into our formula, we get:
(51 + 180)/2 = 115.5
Thus, the number halfway between 51 and 180 is 115.5.
To check that our answer is correct, we subtract 51 from 115.5 and subtract 115.5 from 180 and compare the two numbers:
115.5 - 51 = 64.5
180 - 115.5 = 64.5
As you can see, the halfway number is 64.5 higher than 51 and 64.5 lower than 180. Therefore, our halfway between answer of 115.5 above is correct.
Halfway Between
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Halfway Between 51 and 181
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