When you ask "What number is halfway between 2 and 129?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=2 and Y=129.
To find the number halfway between 2 and 129, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 2 and 129 into our formula, we get:
(2 + 129)/2 = 65.5
Thus, the number halfway between 2 and 129 is 65.5.
To check that our answer is correct, we subtract 2 from 65.5 and subtract 65.5 from 129 and compare the two numbers:
65.5 - 2 = 63.5
129 - 65.5 = 63.5
As you can see, the halfway number is 63.5 higher than 2 and 63.5 lower than 129. Therefore, our halfway between answer of 65.5 above is correct.
Halfway Between
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Halfway Between 2 and 130
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