When you ask "What number is halfway between 0 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=0 and Y=129.
To find the number halfway between 0 and 129, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 0 and 129 into our formula, we get:
(0 + 129)/2 = 64.5
Thus, the number halfway between 0 and 129 is 64.5.
To check that our answer is correct, we subtract 0 from 64.5 and subtract 64.5 from 129 and compare the two numbers:
64.5 - 0 = 64.5
129 - 64.5 = 64.5
As you can see, the halfway number is 64.5 higher than 0 and 64.5 lower than 129. Therefore, our halfway between answer of 64.5 above is correct.
Halfway Between
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Halfway Between 0 and 130
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