When you ask "What number is halfway between 1 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=1 and Y=129.
To find the number halfway between 1 and 129, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 1 and 129 into our formula, we get:
(1 + 129)/2 = 65
Thus, the number halfway between 1 and 129 is 65.
To check that our answer is correct, we subtract 1 from 65 and subtract 65 from 129 and compare the two numbers:
65 - 1 = 64
129 - 65 = 64
As you can see, the halfway number is 64 higher than 1 and 64 lower than 129. Therefore, our halfway between answer of 65 above is correct.
Halfway Between
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Halfway Between 1 and 130
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