When you ask "What number is halfway between 51 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=51 and Y=129.
To find the number halfway between 51 and 129, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 51 and 129 into our formula, we get:
(51 + 129)/2 = 90
Thus, the number halfway between 51 and 129 is 90.
To check that our answer is correct, we subtract 51 from 90 and subtract 90 from 129 and compare the two numbers:
90 - 51 = 39
129 - 90 = 39
As you can see, the halfway number is 39 higher than 51 and 39 lower than 129. Therefore, our halfway between answer of 90 above is correct.
Halfway Between
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Halfway Between 51 and 130
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