When you ask "What number is halfway between 55 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=55 and Y=129.
To find the number halfway between 55 and 129, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 55 and 129 into our formula, we get:
(55 + 129)/2 = 92
Thus, the number halfway between 55 and 129 is 92.
To check that our answer is correct, we subtract 55 from 92 and subtract 92 from 129 and compare the two numbers:
92 - 55 = 37
129 - 92 = 37
As you can see, the halfway number is 37 higher than 55 and 37 lower than 129. Therefore, our halfway between answer of 92 above is correct.
Halfway Between
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Halfway Between 55 and 130
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