When you ask "What number is halfway between 46 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=46 and Y=129.
To find the number halfway between 46 and 129, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 46 and 129 into our formula, we get:
(46 + 129)/2 = 87.5
Thus, the number halfway between 46 and 129 is 87.5.
To check that our answer is correct, we subtract 46 from 87.5 and subtract 87.5 from 129 and compare the two numbers:
87.5 - 46 = 41.5
129 - 87.5 = 41.5
As you can see, the halfway number is 41.5 higher than 46 and 41.5 lower than 129. Therefore, our halfway between answer of 87.5 above is correct.
Halfway Between
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Halfway Between 46 and 130
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