When you ask "What number is halfway between 16 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=16 and Y=129.
To find the number halfway between 16 and 129, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 16 and 129 into our formula, we get:
(16 + 129)/2 = 72.5
Thus, the number halfway between 16 and 129 is 72.5.
To check that our answer is correct, we subtract 16 from 72.5 and subtract 72.5 from 129 and compare the two numbers:
72.5 - 16 = 56.5
129 - 72.5 = 56.5
As you can see, the halfway number is 56.5 higher than 16 and 56.5 lower than 129. Therefore, our halfway between answer of 72.5 above is correct.
Halfway Between
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Halfway Between 16 and 130
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